KR20170022764A - Apparatus for preventing over pressure in fuel cell of hydrogen feed system and method thereof - Google Patents

Abstract

The present invention relates to an apparatus and a method for preventing over pressure in a hydrogen feed system for a fuel cell, which are capable of reliably adjusting pressure. Provided is the apparatus for preventing over pressure in a hydrogen feed system for a fuel cell, comprising: a base block which is installed in a hydrogen feed line of the hydrogen feed system for feeing hydrogen to the fuel cell, and which is provided with a first valve hole through which the hydrogen of the hydrogen feed line is introduced; a valve casing which is disposed in the upper portion of the base block, and which includes a poppet mounting area, adapted to be interconnected to the first valve hole, inside the casing; an outer poppet which is disposed in the poppet mounting area so that the outer poppet can be supported on the first valve hole, and which includes a second valve hole, adapted to be interconnected to the first valve hole, in the bottom of the poppet; and an inner poppet which is supported on the second valve hole, and which is disposed inside the outer poppet. The inner poppet disposed inside the outer poppet opens the second valve hole of the outer poppet in response to the malfunction of the outer poppet.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydrogen supply system for a fuel cell,

The present invention relates to a hydrogen supply system for a fuel cell, and more particularly, to an overpressure prevention apparatus and method for regulating the pressure of hydrogen in a hydrogen supply line for supplying hydrogen to a fuel cell.

Generally, a hydrogen fuel cell vehicle is an electric powered electric vehicle produced from a fuel cell.

A hydrogen fuel cell vehicle has a stack as a main body of the fuel cell and a balance of plant (BOP) necessary for operation around the stack so as to turn the motor and run the vehicle while generating electricity from the hydrogen fuel .

The peripheral auxiliaries consist of a fuel processing system, air, humidification, exhaust, heat recovery, and re-enrichment.

Particularly, the hydrogen fuel supply system includes an ejector for supplying the hydrogen of the hydrogen storage source to the fuel cell stack, a hydrogen supply line connected between the ejector and the stack, a pressure regulator installed in the hydrogen supply line, a humidifier connected to the stack, A hydrogen recycle line, and a vent system.

The pressure regulator is, for example, a relief valve (commonly known in the art as a "pressure relief valve" or "PRV (Pressure Relief Valve)").

The relief valve regulates the pressure so that the supply pressure of the hydrogen supplied to the stack through the hydrogen supply line is not excessively raised. The pressure of the hydrogen injected into the stack may be a normal pressure, but may be a cracking pressure or higher that exceeds the elasticity of the valve spring. In this case, the valve is opened and the hydrogen pressure is lowered. When the pressure of the hydrogen returns to the normal pressure after the valve is opened, the valve is shut off.

In the relief valve according to the related art, the valve spring is in contact with the inner wall surface of the valve housing. There is a problem that the valve spring sticks to the inner wall surface of the valve housing due to liquid condensation or freezing of the liquid at a low temperature below the freezing point.

Accordingly, in the conventional art, the poppet connected to the valve spring is not opened, so that the discharge pressure of the hydrogen is greatly increased, and thus the operation of the valve is not properly performed even at a high pressure.

Further, when the relief valve is additionally provided, the size of the relief valve is enlarged, thereby causing a problem of securing a space for installing the valve.

Further, when the relief valve, which is a safety device against the pressure restriction of hydrogen supplied to the stack, is not operated, the stack is damaged.

In addition, when an electrical sensor is mounted on the relief valve, there is a disadvantage that a circuit configuration and an installation space are required for installation of the sensor.

When two or more relief valves are mounted on the hydrogen supply line in the prior art, it is necessary to perform the operation as many as the number of valves in the assembly line of the vehicle. In the case of mounting electric parts such as sensors, And thus, there is a problem that the working time and manpower are increased.

Therefore, it is urgently required to research and develop a means capable of grasping the malfunction of the relief valve before the stack damage, without increasing the valve size excessively, while realizing a double safety structure for increasing the operating reliability of the relief valve .

SUMMARY OF THE INVENTION It is an object of the present invention to provide an internal poppet for an internal poppet that is provided with an internal poppet inside the external poppet so as to eliminate the problem of valve inoperability, And an overpressure prevention device and method of the battery hydrogen supply system.

In order to achieve the above object, there is provided an over-pressure prevention apparatus for a hydrogen supply system for a fuel cell according to the present invention, which is installed in a hydrogen supply line of a hydrogen supply system for supplying hydrogen to a fuel cell, A base block having a first valve hole; A valve casing disposed in an upper portion of the base block and having a poppet mounting area interconnected with the first valve hole in a casing; An outer poppet disposed at the poppet mounting region to be supported by the first valve hole and having a second valve hole interconnected with the first valve hole at a poppet bottom; And an inner poppet which is supported by the second valve hole and is disposed inside the outer poppet, wherein the inner poppet disposed inside the outer poppet is in contact with the inner poppet of the outer poppet, 2 Open the valve hole.

 The base block further includes a vent hole spaced from the first valve hole so as to discharge the hydrogen of the valve casing through the hydrogen discharge line and penetrate in the thickness direction of the base block.

The valve casing further includes a hydrogen discharge area formed inside the valve casing to interconnect the poppet mounting area and the vent hole.

Wherein the outer poppet includes a hollow head portion integrally protruding from the outside of the second valve hole so as to be seated in the first valve hole, An outer spring receiving portion formed integrally on the outer side of the hollow head portion with reference to the upper side of the outer sealing member; and an outer spring receiving portion formed between the outer spring receiving portion and the second valve hole A hollow body portion extending in a vertical direction from an upper surface of the hollow head portion as a reference and serving as an outer wall of a receiving space for disposing the inner poppet in the inside of the outer poppet, And a cover in which a discharge port is formed to discharge hydrogen out of the outer poppet.

The outer poppet includes an outer spring disposed between the outer spring receiving portion and the inner surface of the valve casing so as to bring the outer poppet into close contact with the first valve hole.

The external poppet further includes an alarm device installed at the outlet so that sound is generated by a diaphragm vibrating with pressure of hydrogen flowing into the outlet.

Wherein the inner poppet has an inner head portion that is smaller than the inner diameter of the hollow body portion of the outer poppet and has a diameter larger than the hole size of the outlet port of the cover and is seated in the second valve hole, An inner sealing member provided on the inner head portion to seal the gap between the valve holes, an inner spring receiving portion integrally formed on the outer side of the inner head portion with respect to the upper side of the inner sealing member, And a shaft portion extending in the vertical direction from the center of the upper surface of the inner head portion at a diameter smaller than the diameter of the head portion.

And the inner poppet includes an inner spring disposed between the inner spring receiving portion and the cover so as to bring the inner poppet into close contact with the second valve hole.

The inner spring is designed to exert a relatively large elastic force as compared with the outer spring.

According to another aspect of the present invention, there is provided a method for preventing overpressure of a hydrogen supply system for a fuel cell, the hydrogen supply system including a hydrogen supply line for supplying hydrogen to a fuel cell, And an inner poppet which opens and closes the second valve hole of the outer poppet in accordance with the elastic force of the inner spring and the pressure of the hydrogen inside the outer poppet. The pressure of the hydrogen being transferred to the first valve hole and the second valve hole; Opening the first valve hole by the outer poppet by the pressure of the hydrogen exceeding the elastic force of the outer spring; The inner poppet opening the second valve hole of the outer poppet by the hydrogen exceeding the elastic force of the inner spring in accordance with the operation failure of the outer poppet; And generating hydrogen through the second valve hole via the alarm device provided in the outer poppet.

In the over-pressure preventing device for a hydrogen supply system for a fuel cell according to the present invention, an inner poppet is provided inside an outer poppet. Even if an emergency occurs due to an inoperable state of a basic outer poppet, So that the reliability of the valve operation can be ensured.

In addition, the overpressure prevention method of the hydrogen supply system for a fuel cell according to the present invention minimizes the damage to the housing through the double safety structure of the outer poppet and the inner poppet through reliable overpressure of the stack, which is the main body of the fuel cell And it has an effect of greatly contributing to an increase in the lifetime of the stack.

1 is a perspective view of an overpressure prevention device of a hydrogen supply system for a fuel cell according to an embodiment of the present invention;
2 is a cross-sectional view taken along the line AA shown in Fig.
3 is a partial cross-sectional view of the outer poppet and the outer spring shown in Fig.
Fig. 4 is a front view of the inner poppet and the inner spring shown in Fig. 2; Fig.
5 and 6 are sectional views for explaining the operation of the overpressure prevention device shown in Fig.
7 is a flowchart for explaining an overpressure prevention method by the overpressure prevention device shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined by the claims.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises " and / or "comprising" when used in this specification is taken to specify the presence or absence of one or more other components, steps, operations and / Or add-ons. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of an overpressure prevention device for a hydrogen supply system for a fuel cell according to an embodiment of the present invention.

Referring to FIG. 1, the present embodiment is an overpressure prevention device installed in a hydrogen supply line of a hydrogen supply system for supplying hydrogen to a fuel cell.

Specifically, the overpressure prevention device according to the present embodiment is a fuel cell that supplies hydrogen and air to a fuel cell, which is generally called a stack (STACK), and converts the electrochemical reaction energy of hydrogen and air directly into electric energy Battery system.

More specifically, the overpressure prevention device according to the present embodiment is for regulating the pressure of hydrogen when supplying hydrogen to the fuel cell. For example, the hydrogen supply system can be applied to a hydrogen recirculation system that mixes separately stored hydrogen and unreacted hydrogen discharged from the fuel cell with an ejector, and supplies the mixed hydrogen to the fuel cell through a hydrogen supply line (not shown) Do.

At this time, the overpressure prevention device provides a basic function of regulating the elevated pressure when the supply pressure of the hydrogen supplied to the fuel cell through the hydrogen supply line is excessively increased. In addition, the overpressure prevention device realizes a double safety structure even in a situation where it is impossible to control the pressure by closing the first valve hole in the overpressure prevention device for performing basic functions due to malfunction or failure of the outside poppet have. That is, in the overpressure prevention device of the present embodiment, the inner poppet disposed inside the outer poppet also functions to open the second valve hole interconnected with the first valve hole to adjust the elevated pressure, .

The overpressure prevention device according to the present embodiment is constructed so as to be disassembled and assembled and is made of a material capable of ensuring robust operating performance even in an environment of extreme pressure and temperature applied to a hydrogen supply line. (10), and a valve casing (20).

2 is a cross-sectional view taken along the line A-A shown in Fig.

2, the overpressure prevention device according to the present embodiment includes an outer poppet 30, an outer spring 40, an inner poppet 50, and an inner spring 60 disposed inside a valve casing 20 do.

The base block 10 has a plate-like body to be mounted on the hydrogen supply line. Further, the base block 10 is fastened to the opening (not shown) of the hydrogen supply line by using a plurality of bolts and bolt holes.

The base block 10 has a first valve hole 11 penetrating in the thickness direction of the body. Here, the first valve hole 11 is interconnected with the hydrogen supply line through the opening of the hydrogen supply line.

Further, the base block 10 has a vent hole 12. The vent hole 12 serves to discharge the hydrogen of the valve casing 20 through the hydrogen discharge line. The vent hole 12 is spaced from the first valve hole 11 along the longitudinal direction of the base block 10 and passes through the thickness of the base block 10. These vent holes 12 are interconnected to the connecting piping member (not shown) of the hydrogen discharge line.

The valve casing 20 is a structure capable of discharging the hydrogen introduced into the vent hole 12 after the hydrogen is supplied from the hydrogen supply line when the hydrogen pressure of the hydrogen supply line becomes equal to or higher than the normal supply pressure.

To this end, the valve casing 20 is a structure in which the upper portion of the casing and the casing side portion connected to the upper portion of the casing are closed, and the bottom portion of the casing is opened.

A flange having a plurality of bolt holes is integrally formed on the outer side of the bottom of the valve casing 20. [ The valve casing 20 is detachably assembled to the base block 10 through a flange, a bolt hole, and a fastening bolt.

The base block 10 and the valve casing 20 are detachably assembled for convenience of manufacturing, and may be integrally formed through design modification.

Particularly, the valve casing 20 has a poppet mounting region 21 formed on one side of the inside thereof and a hydrogen discharge region 22 formed on the other side of the inside thereof.

The poppet mounting area (21) is interconnected with the first valve hole (11). The poppet mounting area 21 is used as an installation position of the outer poppet 30, the outer spring 40, the inner poppet 50, and the inner spring 60. The inner structure of the poppet mounting area 21 is designed so that the side of the outer spring 40 is not in contact with the inner surface of the inner structure of the poppet mounting area 21, .

A cap 29 is further provided on the upper portion of the valve casing 20 so as to open the upper portion of the valve casing 20 for maintenance or repair to the poppet mounting area 21.

The hydrogen discharge area 22 serves to connect the poppet mounting area 21 and the vent hole 12 with each other. The sidewall of the valve casing 20 enclosing the hydrogen discharge region 22 is a streamlined structure such as an elbow shape or a curved tube member shape or the like and can smoothly change the flow path of hydrogen and discharge it quickly. By this streamlined structure, the hydrogen in the poppet mounting area 21 flows in a curved shape in the hydrogen discharge area 22 and can be smoothly discharged toward the vent hole 12.

The outer poppet 30 is a hollow structure for installing the inner poppet 50 inside the poppet and is a valve opening means.

The outer poppet (30) is disposed in the poppet mounting area (21) so as to be supported by the first valve hole (11). The outer poppet 30 has a second valve hole 31 formed in the bottom of the poppet to be interconnected with the first valve hole 11.

The outer spring 40 is supported on the upper portion (e.g., the casing ceiling) of the valve casing 20 to provide an elastic force to the outer poppet 30. The outer spring 40 is formed to surround the outside of the outer poppet 30 in a non-contact manner.

The inner poppet (50) is disposed inside the outer poppet (30) to be supported by the second valve hole (31). A portion corresponding to the outer side of the inner poppet 50 or the outer side of the inner spring 60 is placed in a noncontact state with the inner peripheral surface of the hollow body portion 36 of the outer poppet 30, The freezing of the liquid prevents the inner spring 60 from sticking to the inner circumferential surface of the hollow body portion 36 of the outer poppet 30 and achieving reliable valve opening.

The structure in which the inner poppet 50 is provided inside the outer poppet 30 can overcome the problem that the valve size becomes excessively large.

The inner spring 60 is supported on the cover 39 which is the upper part of the outer poppet 30 to provide an elastic force to the inner poppet 50. The inner spring 60 is formed to surround the outside of the inner poppet 50 in a non-contact manner.

The inner spring 60 has a relatively small diameter as compared with the outer spring 40. At this time, the inner spring 60 is manufactured so as to exert a relatively large elastic force as compared with the outer spring 40 through a manufacturing method that can increase the spring elasticity.

FIG. 3 is a partial sectional view of the outer poppet and the outer spring shown in FIG. 2, and FIG. 4 is a front view of the inner poppet and the inner spring shown in FIG.

Referring to FIG. 3, the outer poppet 30 includes a hollow head portion 32 that protrudes integrally from the outside of the second valve hole 31.

The hollow head portion 32 has a hollow cross section by a second vane hole 31 formed therein.

The outer shape of the hollow head portion 32 is formed in a conical cross-sectional shape with respect to the center line CL. Such a cross-sectional shape exerts a self-alignment function in which the center line CL of the hollow head portion 32 naturally coincides with the center of the first valve hole of the base block described above.

An inclined surface and a step are formed on the outer surface of the hollow head portion 32 so as to be easily seated or separated in the first valve hole of the base block.

The outer sealing member 33 is installed in the hollow head portion 32 to seal the gap between the hollow head portion 32 and the first valve hole of the base block.

The outer sealing member 33 is provided as a hermetic sealing means such as an o-ring, a quad-ring, a gasket, or the like.

The outer spring receiving portion 34 is integrally formed on the outer side of the hollow head portion 32 with reference to the upper side of the outer sealing member 33. The outer spring bearing portion 34 has a circular disk shape protruding along the outer circumferential direction of the hollow head portion 32.

On the upper surface of the outer spring bearing portion 34, there is formed a ring-shaped groove 35 for seating the outer spring 40. The outer spring 40 is not easily separated from the outer poppet 30 by the outer wall of the ring groove 35.

The hollow body portion 36 extends in the vertical direction from the upper surface of the hollow head portion 32 with reference to the space between the outer spring bearing portion 34 and the second valve hole 31. The hollow body portion 36 is an outer wall of a receiving space for placing the inner poppet 50 shown in FIG. 4 inside the outer poppet 30. A female screw is formed on the inner peripheral surface of the upper end of the hollow body 36.

The cover 39 is made of a ring-shaped plate member. On the outer circumferential surface of the cover 39, a male screw is formed. The cover 39 is a means for closing the upper portion of the hollow body portion 36.

The cover 39 is screwed to the upper end of the hollow body portion 36, that is, the upper end inner peripheral surface of the hollow body portion 36. A discharge port 38 is formed at the center of the cover 39 to discharge the hydrogen introduced into the receiving space of the outside poppet 30 to the outside of the outside poppet 30.

The outlet 38 of the cover 39 is also used as the installation position of the alarm device 70 shown in Fig. If the alarm device 70 is not installed at the discharge port 38, the hydrogen in the receiving space of the outside poppet 30 is immediately discharged outside the outside poppet 30.

Further, if the alarm device 70 is installed at the discharge port 38, the hydrogen in the receiving space is discharged through the gap between the diaphragms of the alarm device 70. The alarm device 70 vibrates the diaphragm to generate sounds such as a beep sound or a warning sound. For example, the alarm device 70 may be a whistle for generating a warning sound, but may not be limited to a whistle in the case of a mechanical device generating a sound by a pressure action.

For example, the alarm device 70 is configured to generate sound by a diaphragm that vibrates at a pressure of hydrogen discharged into the outside poppet 30 after flowing into the discharge port 38. [ The alarm device 70 is installed at the outlet 38 and can be secured by mechanical attachment means such as screwing, welding.

The alarm device 70 notifies the driver or the user of the emergency situation in which the inner poppet 50 is operated in an unoperated state of the outer poppet 30, and has an effect of being able to be inspected.

Further, since the alarm device 70 is a mechanical acoustic-energy-generating device operated by the discharge of hydrogen, it is possible to solve the problem caused by constituting the circuit relating to the sensor or the sensor and to easily manufacture the overpressure prevention device And the production cost can be reduced.

The outer spring 40 is mounted on the outer poppet 30. For example, the outer spring 40 has an elastic force capable of moving the outer poppet 30, the cover 39, the inner poppet 50, and the inner spring 60 by an elastic force. The outer spring 40 serves to closely contact the first valve hole of the base block of the outer poppet 30.

Referring to Fig. 4, the inner poppet 50 includes an inner head portion 51 that is seated in the second valve hole 31 of Fig.

The inner head portion 51 has a diameter smaller than the inner diameter of the hollow body portion 36 of the outer poppet 30 shown in FIG. 3 and larger than the hole size of the discharge port 38 of the cover 39.

The inner head portion 51 is formed in a conical cross-sectional shape filled with the inside. The inner head portion 51 also exhibits a self-alignment function that naturally coincides with the center line CL of the second valve hole 31 of the outer poppet 30. [

The inner sealing member 52 serves to seal a gap between the inner head portion 51 and the second valve hole 31. The inner sealing member 52 is provided in the inner head portion 51 and is provided in a sealing member installation groove formed at a step between the inclined surface and the outer surface of the inner head portion 51, for example.

The inner spring receiving portion 53 is integrally formed on the outer side of the inner head portion 51 with reference to the upper side of the inner sealing member 52. A ring-shaped groove (not shown) is formed on the upper surface of the inner spring receiving portion 53 to allow the inner spring 60 to be seated.

The inner spring 60 is prevented from being easily detached from the inner poppet 50 by the outer wall of the ring-shaped groove of the inner spring bearing portion similarly to the structure of Fig.

The shaft portion 54 extends in the vertical direction from the center of the upper surface of the inner head portion 51 with a diameter smaller than the diameter of the inner head portion 51. [ At the point where the shaft portion 54 and the inner head portion 51 are connected to each other, a reinforcing portion 55 is further provided. The reinforcing portion 55 has a cross section in which the diameter gradually decreases from the inner head portion 51 to the shaft portion 54. An inclined surface is formed outside the reinforcing portion 55. The reinforcing portion 55 serves to increase the structural rigidity and durability between the shaft portion 54 and the inner head portion 51.

The inner spring 60 is mounted on the inner poppet 50. For example, the inner spring 60 functions to bring the inner poppet 50 into close contact with the second valve hole 31 of the outer poppet 30 by an elastic force. This inner spring 60 is disposed between the inner spring bearing portion 53 and the cover 39 of the outer poppet.

Particularly, the inner spring 60 is designed to exert a relatively large elastic force as compared with the outer spring 40 so that the outer poppet 30 is opened earlier than the inner poppet 50 as the hydrogen pressure increases.

Hereinafter, the overpressure prevention method according to the operation of the overpressure prevention device of the hydrogen supply system for a fuel cell according to the present embodiment will be described.

5 and 6 are sectional views for explaining the operation of the overpressure prevention device shown in FIG. 1, and FIG. 7 is a flowchart for illustrating an overpressure prevention method by the overpressure prevention device shown in FIG.

2 and 5, the first valve hole 11 has a relatively large diameter. The second valve hole (31) is arranged in series at the inner side or the upper side of the first valve hole (11) and has a relatively small diameter. The hydrogen of the normal injection pressure to be supplied to the fuel cell flows into the hydrogen supply line F connected to the first valve hole 11 and the second valve hole 31.

This normal injection pressure is smaller than the elastic force of the outer spring 40 or the inner spring 60. Therefore, hydrogen in the hydrogen supply line F is supplied only to the fuel cell without being discharged to the vent system.

When the pressure in the hydrogen supply line F is increased beyond the normal injection pressure (for example, overpressure occurs), the outer poppet 30 is changed from the state of FIG. 2 to the state of FIG.

That is, the outer spring 40 having a relatively weak elastic force is compressed first. The outer poppet 30 moves, and the first valve hole 11 is opened.

The hydrogen flows into the interior of the valve casing 20 through the gap between the outer sealing member 33 of the outer poppet 30 and the first valve hole 11 and then flows through the vent hole 12 into the hydrogen discharge line ≪ / RTI >

As a result, when the pressure in the hydrogen supply line F is reduced to reach the normal injection pressure again, the first valve hole 11 is closed again as shown in FIG.

The overproduction of hydrogen during the basic hydrogen supply can be controlled by opening and closing the outer poppet 30.

However, there is a case where the outside poppet 30 becomes inoperable state as shown in Fig. In this case, the first valve hole 11 can not be opened, and an emergency situation in which the pressure of hydrogen is increased may occur.

In this emergency situation, the inner poppet 50 provided inside the outer poppet 30 in an inoperable state opens the second valve hole 31 to discharge hydrogen through the vent hole 12, .

This series of processes corresponds to the overpressure prevention method as shown in FIG.

Referring to FIG. 7, the overpressure prevention method according to the present embodiment includes a step (S10) in which the pressure of hydrogen is transmitted to the first valve hole and the second valve hole, and the pressure of the hydrogen exceeding the elastic force of the outer spring And opening the first valve hole by the outer poppet (S20).

These steps S10 and S20 may be the operation of the basic safety device for protecting the fuel cell.

(S30) in which the inner poppet opens the second valve hole of the outer poppet by the hydrogen exceeding the elastic force of the inner spring in accordance with the operation failure of the outer poppet in the above-mentioned emergency situation, The step S40 may be performed in which the hydrogen via the two valve holes generates sound via the alarm device provided in the outer poppet.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments described in the present invention are not intended to limit the scope of the present invention, but are intended to be illustrative, and the scope of the present invention is not limited by these embodiments. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents, which fall within the scope of the present invention as claimed.

10: base block 11: first valve hole
12: Vent hole 20: Valve casing
30: outer poppet 40: outer spring
50: inner poppet 60: inner spring
70: Alarm device

Claims (10)

A base block installed in a hydrogen supply line of a hydrogen supply system for supplying hydrogen to the fuel cell and having a first valve hole into which hydrogen of the hydrogen supply line flows;
A valve casing disposed in an upper portion of the base block and having a poppet mounting area interconnected with the first valve hole in a casing;
An outer poppet disposed at the poppet mounting region to be supported by the first valve hole and having a second valve hole interconnected with the first valve hole at a poppet bottom; And
And an inner poppet supported by the second valve hole and disposed inside the outer poppet,
The inner poppet disposed inside the outer poppet opens the second valve hole of the outer poppet in accordance with the failure of operation of the outer poppet
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
The apparatus as claimed in claim 1,
Further comprising a vent hole spaced from the first valve hole so as to discharge the hydrogen of the valve casing through the hydrogen discharge line, the vent hole being penetrated in the thickness direction of the base block
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
3. The valve apparatus according to claim 2,
And a hydrogen discharge area formed in the valve casing to interconnect the poppet mounting area and the vent hole
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
[2] The apparatus according to claim 1,
A hollow head portion integrally protruding from the outside of the second valve hole so as to be seated in the first valve hole;
An outer sealing member provided on the hollow head portion for sealing a gap between the hollow head portion and the first valve hole,
An outer spring receiving portion formed integrally on the outer side of the hollow head portion with reference to an upper side of the outer sealing member,
A hollow body portion extending in a vertical direction from an upper surface of the hollow head portion as a reference between the outer spring receiving portion and the second valve hole and serving as an outer wall of a receiving space for disposing the inner poppet inside the outer poppet, , And
And a cover screwed to the upper end of the hollow body part and having a discharge port formed therein for discharging the hydrogen out of the outer poppet
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
[5] The apparatus of claim 4,
And an outer spring disposed between the outer spring receiving portion and the inner surface of the valve casing so as to bring the outer poppet into close contact with the first valve hole
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
[5] The apparatus of claim 4,
And an alarm device installed at the discharge port so as to generate sound by a diaphragm vibrating with the pressure of hydrogen flowing into the discharge port
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
6. The internal combustion engine according to claim 5,
An inner head portion having a diameter smaller than an inner diameter of the hollow body portion of the outer poppet and larger than a hole size of the discharge port of the cover,
An inner sealing member provided on the inner head portion to seal a gap between the inner head portion and the second valve hole,
An inner spring bearing portion integrally formed on the outer side of the inner head portion with respect to the upper side of the inner sealing member,
And a shaft portion extending in a direction perpendicular to the center of the upper surface of the inner head portion at a diameter smaller than the diameter of the inner head portion
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
8. The internal poppet as claimed in claim 7,
And an inner spring disposed between the inner spring receiving portion and the cover so as to bring the inner poppet into close contact with the second valve hole
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
9. The internal combustion engine according to claim 8,
And is designed to exhibit a relatively large elastic force as compared with the outer spring
The over-pressure prevention device of the hydrogen supply system for a fuel cell.
An outer poppet installed in the hydrogen supply line of the hydrogen supply system for supplying hydrogen to the fuel cell and opening / closing the first valve hole corresponding to the elastic force of the outer spring and the hydrogen pressure; And an inner poppet that opens and closes the second valve hole of the outer poppet in response to the elastic force of the hydrogen spring and the pressure of the hydrogen,
The pressure of the hydrogen being transferred to the first valve hole and the second valve hole;
Opening the first valve hole by the outer poppet by the pressure of the hydrogen exceeding the elastic force of the outer spring;
The inner poppet opening the second valve hole of the outer poppet by the hydrogen exceeding the elastic force of the inner spring in accordance with the operation failure of the outer poppet; And
And generating hydrogen through the second valve hole via the alarm device provided in the outer poppet
A method for preventing overpressure of a hydrogen supply system for a fuel cell.

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