KR20200086048A - Safety valve for hydrogen charging stations - Google Patents

Abstract

The present invention relates to a safety valve for a hydrogen charging station, which comprises: a lower body having an inlet having a coupling hole at a lower side and allowing overpressure to be introduced into the coupling hole, an overpressure passage formed at the center of the inlet, and a disk housing having a plurality of discharge holes formed on an upper portion of the overpressure passage; an upper body coupled to the lower body and having an outlet at one side so as to discharge the overpressure discharged through the discharge holes at one side to the atmosphere; and an adjuster having a disk inserted into the disk housing to open and close an upper end of the overpressure passage, a stem arranged to be upright in an axial central direction by inserting a stem head into the disk, and a lower spring disk, a pressing spring and an upper spring disk sequentially arranged on an upper portion of the stem head, wherein the upper spring disk is coupled to an upper side of the upper body to adjust the force for pressing the disk by a spring adjuster screw-coupled to an upper portion of a spring housing coupled to the upper body. The safety valve for a hydrogen charging station of the present invention further comprises: an auxiliary pressing means for applying a pressing force to the pressing spring on an upper portion of the upper spring disk; and a concentration maintaining means for always concentrating a force of the pressing spring and the auxiliary pressing means between the stem head and the disk in the axial central direction of the safety valve when the force is transferred to the disk. Accordingly, the quality and durability of the safety valve can be improved and external competitiveness can increase.

Description

Safety valve for hydrogen filling station {SAFETY VALVE FOR HYDROGEN CHARGING STATIONS}

The present invention relates to a safety valve for a hydrogen charging station, and more specifically, it is mounted on a tank that is filled with hydrogen, and when the pressure inside the tank is above a set pressure, it is quickly discharged to the outside to improve safety valve to ensure safety. It is about the provision of.

In general, the valve is used to control the flow, such as the supply of fluid, such as air, gas, liquid, etc. In general, it is customary for a valve used for industrial purposes to generate a pressure of 100 bar or less.

However, a line for supplying hydrogen to a storage tank, a place for using hydrogen in a hydrogen storage tank, for example, a filling facility for filling hydrogen with a hydrogen vehicle, a filling gun, a filling line, etc. Is generated, and an ultra high pressure valve is used to easily control such a high pressure fluid.

In the past, various types of safety valves are used for quickly discharging the excess pressure to the outside so that it can be excluded from the risk of explosion when a pressure greater than the set pressure occurs. .

Patent Document 1, in the pressure relief valve,

A first body; A second body coupled to the first body and having an operation chamber having an opening therein; A top cap covering an upper portion of the first body; A first bar provided in the inner space of the first body and the top cap; A second bar connected to the first bar; An opening/closing part that opens and closes according to the pressure inside the container at the lower end of the second bar; And it is configured to include a spring that is coupled to the first bar and the second bar to apply elasticity to the opening and closing portion.

Patent Document 2, in the safety valve applied to the high-pressure regulator,

A guide body coupled to the valve port provided on the body of the high-pressure regulator, a valve body coupled to the upper end of the guide body and opening the valve port when overpressure occurs in a state where the valve port is closed, installed inside the valve body, and Relief to relieve overpressure by discharging fuel when overpressure occurs inside the high-pressure regulator, including a lower spring that provides elasticity to the valve body and a discharge pipe that is coupled to the lower portion of the guide body and discharges fuel when the valve body is opened. It is a configuration that provides a purge valve function that separates the valve from the body and discharges fuel inside the high-pressure regulator.

Utility Model Application No. 20-2016-0007561 Patent Application No. 10-2016-0131516

No.

Patent document 1 of the prior art as described above, the opening surface of the opening and closing part is first opened in a state where the first and second bars pressed by the spring are blocking the opening and closing part, thereby preventing rupture due to overpressure, and after that, the opening and closing part is directed upward. It is configured to rise and open to discharge through the opening.

Patent Document 2, the piston and the shaft by the fuel input to the input port is raised and supplied under reduced pressure, and if the pressure is reduced above the set value, the valve body descends and discharged to the outside through the discharge pipe to ensure safety. It is a configuration.

In the case of patent documents 1 and 2 as described above, it is not a safety valve used in a hydrogen charging station, but it is not opened when it is below a set pressure, but when it is above a set pressure, it is opened to release the overpressure quickly to the outside to ensure safety. In Essex.

The configuration of the safety valve currently used in the hydrogen filling station is also composed of the above-mentioned patent document and the same configuration. The upper part of the body having the inlet and the outlet is directed to the inlet at the bottom of the stem, which is vertically driven by a spring. It is intended to cut off the overpressure passages that communicate with each other.

In this state, it is possible to determine the set pressure by adjusting the elastic modulus or the pressing force of the spring. If the pressure is below the set pressure, the safety valve does not operate by the force pressed by the spring, and overcomes the force pressed by the spring when the pressure inside the tank exceeds the set value. The overpressure is discharged to the outside, thereby ensuring safety.

Because it depends on the spring as described above, the elastic modulus of the spring for a considerable period of time is not the same as the initial one, and the force is generally weak, so it is impossible to continuously maintain the force corresponding to the initially set pressure. Despite this, it causes the valve to open.

Conversely, over a long period of time, the spring is fixed to the set elastic modulus, and even when the pressure inside the tank does not move even when the pressure is changed, it does not rise even in the overpressure state. As a result, there is a very high risk of safety accidents that may cause the tank to explode.

In addition, if there is an assembly in which the stem maintained by the spring is not accurately maintained, the stem does not concentrate the force in the center of the shaft center of the disk blocking the overpressure passage, and at this time, the opposite position biased in one direction Since it provides a cause of the leakage, various problems such as failing to guarantee safety are occurring.

Therefore, in the present invention, as an invention to solve the above problems, the overpressure passageway formed in the center of the inlet 106 and the inlet 106, which has an inlet port 101 at the lower side and overpressure can be introduced into the inlet port. A lower body 102 in which a disc housing 109 having a plurality of discharge holes 108 formed on an upper portion of the overpressure passage 107 and 107 is combined;

An upper body 103 coupled to the lower body 102 by forming an outlet 110 on one side so as to discharge the overpressure discharged through the discharge hole 108 on one side into the atmosphere;

The disc 111 is inserted into the disc housing 109 to open and close the upper end of the overpressure passage 107, and the stem 113 is inserted into the disc 111 and the stem 113 is erected in the axial center direction. A lower spring disc 114, a pressurizing spring 115, and an upper spring disc 116 are sequentially arranged on an upper portion of the stem head 112, and the upper spring disc 116 is a spring coupled to the upper body 103 Safety for a hydrogen charging station consisting of an adjuster (105) coupled to the upper side of the upper body (103) to adjust the force to press the disk (111) by a spring adjuster (118) screwed to the top of the housing (117) In the valve 100;

An auxiliary pressing means 130 capable of adding a pressing force to the pressing spring 115 on the upper portion of the upper spring disc 116;

Between the stem head 112 and the disc 111, the axis of the safety valve 100 is always applied when the force of the pressure spring 115 and the auxiliary pressing means 130 is transmitted to the disc 111 through the stem 113 Further comprising a concentration holding means 150 that can focus in the central direction;

It is possible to continuously maintain the normal condition even if there is a decrease in elasticity of the pressurized spring in response to the set pressure, and even if the arrangement of the stem and disk is displaced with respect to the shaft center, the desk can be blocked through the normal connection with the overpressure passage. It is possible to achieve the purpose of improving the quality and durability of the safety valve while excluding concerns about possible safety accidents by giving a function.

The present invention is further provided with an auxiliary pressure means so as to operate normally according to the set pressure even when an abnormality occurs in the spring that applies pressure to the stem and the disc. It has the effect of excluding concerns about safety accidents that may occur while ensuring safety by releasing them.

In the present invention, by allowing the force of the stem to be accurately transmitted to the shaft, the constant force is always placed at the shaft center regardless of the bias of the stem or spring, thereby increasing the airtightness and excluding the possibility of leakage to ensure safety. It is an invention having various effects, such as being able to increase the quality and durability of the safety valve and increase external competitiveness.

1 is an external perspective view showing a safety valve for a hydrogen charging station to which the technology of the present invention is applied.
Figure 2 is a longitudinal sectional view showing a safety valve for a hydrogen charging station to which the technology of the present invention is applied.
Figure 3 is a block diagram showing a centralized extracting means of the safety valve for a hydrogen charging station to which the technology of the present invention is applied.
Figure 4 is a schematic diagram showing the auxiliary pressure means of the safety valve for a hydrogen charging station to which the technology of the present invention is applied.
Figure 5 is another configuration diagram showing an extract of the auxiliary pressure means of the safety valve for a hydrogen charging station to which the technology of the present invention is applied.

Hereinafter, a preferred configuration and operation of the present invention for achieving the above object in connection with the accompanying drawings will be described.

1 is an external perspective view showing a safety valve for a hydrogen charging station to which the technology of the present invention is applied, FIG. 2 is a longitudinal sectional configuration diagram showing a safety valve for a hydrogen charging station to which the technology of the present invention is applied, and FIG. 3 is a technology to which the technology of the present invention is applied Fig. 4 is a block diagram showing the central maintenance means of the safety valve for a hydrogen charging station, and Fig. 4 is a block diagram showing an extracting auxiliary pressure means of the safety valve for a hydrogen charging station to which the technology of the present invention is applied, and Fig. 5 is a technology of the present invention. The auxiliary pressurizing means of the safety valve for a hydrogen charging station to which this is applied will be described together as another configuration diagram.

The safety valve 100 for a conventional hydrogen charging station, the lower body 102 having a coupling port 101 downward so as to be coupled with the filling tank, and the upper body coupled with the lower body 102 via an airtight material The body 103 and the upper body 103 are coupled to the upper portion of the adjust 105.

The lower body 102 is formed to penetrate through the overpressure passage 107 in the center of the inlet 106 and the inlet 106 through which overpressure can be introduced, and a plurality of upper parts of the overpressure passage 107 are provided. The disk housing 109 formed with the discharge hole 108 is fixed and coupled, and an outlet 110 is provided at one side of the upper body 103 so that the overpressure discharged through the discharge hole 108 can be discharged into the atmosphere. ).

The adjust 105 is inserted into the disc housing 109, the disc 111 that opens and closes the upper portion of the overpressure passage 107, and the stem 111 is inserted into the disc 111 to stand upright in the axial center direction. The stem 113 to be combined.

A lower spring disk 114, a pressure spring 115, and an upper spring disk 116 are sequentially arranged on the upper part of the stem head 112, and the upper spring disk 116 is coupled to the upper body 103 It is possible to adjust the force for pressing the disk 111 by a spring adjusting mechanism 118 screwed to the upper portion of the spring housing (117).

The upper portion of the spring housing 117 is closed with an intermittent nut 119 and a cap 120 to maintain the adjusted state, and a leak-proof material is interposed in a position where pressure can leak to prevent leakage. It would be natural to do so.

In the present invention, an auxiliary pressing means 130 capable of adding a pressing force to the pressing spring 115 is further provided on the upper portion of the upper spring disc 116, and the pressing spring is provided between the stem head 112 and the disc 111. When the force of the 115 and the auxiliary pressing means 130 is transmitted to the disk 111 through the stem 113, the concentration holding means 150 that can always concentrate in the axial center direction of the safety valve 100 is further added. It is characterized by being provided.

The auxiliary pressing means 130 fills the fluid 131 in the space between the upper portion of the upper spring disc 116 and the spring housing 117 to assist in reducing the pressing force of the pressurizing spring 115 to reduce the set pressure. Make sure to maintain it continuously.

The fluid 131 may be various, such as liquid or gas, and is built into a fluid housing 132 formed of a tube type of an elastic material such as rubber, silicone or urethane, which is free from contraction and elongation in consideration of the properties of the fluid 131. So that pressure can be generated.

As another example, the elastic body 133 may be built in between the upper spring disc 116 and the spring housing 117 to assist in reducing the pressing force of the pressure spring 115.

The elastic body 133 may be provided with a spring, rubber or silicone or urethane rod, disc body, tube type, etc. to assist the set pressure. It can be implemented in a variety of ways, such as inserting.

Of course, the upper part of the spring housing 117 will be configured to be disassembled and coupled by taking airtight means to insert and leave the fluid 131 and the elastic body 133.

The centralized holding means 150 forms a lower ball groove 151 to be recessed downward at the center position of the inner bottom surface of the disc 111, and is located at the bottom axis center of the stem head 112 that presses the disc 111. The upper ball groove 152 is formed to be recessed upward, and the disc 111 and the stem 113 are interposed through the ball 155 in the lower and upper ball grooves 151 and 152, even though the shaft centers are not aligned. 113) is configured to transmit the force of the disk 111 to the center of the axis.

Looking at the use state of the safety valve 100 for a hydrogen charging station to which the technology of the present invention is applied as described above is as follows.

When the pressure spring 115 determines the force pushing the stem 113 according to the set pressure using the adjust 105, this force is transmitted to the disc 111 through the stem head 112 of the stem 113 Since the lower end of the disc 111 is kept in close contact with the upper end of the overpressure passage 107, when the pressure inside the filling tank is less than or equal to the set value, the pressure does not push the disc 111 up, so the safety valve 100 ) Is in an unopened state.

In this state, when an overpressure occurs in the filling tank and exceeds a set value, a force is transmitted to the overpressure passage 107 through the inlet 106, and this force is the force by which the pressurized spring 115 presses the disk 111. Since the disk 111 is to push up the stem 113 and the pressure spring 115, the overpressure passage 107 is opened and the outlet 110 through the discharge hole 108 formed in the disk housing 109 It is well known that the pressure is quickly released to prevent the risk of explosion.

In the present invention, the pressurized spring 115 presses the disc 111 through the stem 113 and is in close contact with the overpressure passage 107 so that it does not open when the pressure is lower than the set pressure and raises the disc 111 when the pressure is higher than the set pressure. In the process of rapidly discharging the excess pressure, the elasticity of the pressurized spring 115 is maintained for a long time and the disk 111 cannot be pressed according to the set pressure, or the stem 113 or the disk 113 It is characterized in that it is possible to ensure safety by excluding the phenomenon that normal forces cannot be transmitted because they cannot be arranged in a straight line with respect to the axis center.

The generation of the set pressure that can be caused by the elasticity of the pressurized spring 115 is made by the auxiliary pressurizing means 130, and the shaft 113 and the disk 111 may be caused by misalignment due to the misalignment. The lack of force transmission in the direction causes the force of the pressurizing spring 115 and the auxiliary pressing means 130 to be induced in the axial center direction of the safety valve 100 by the centralized holding means 150.

In the case of the auxiliary pressing means 130, the constant (elasticity) of the pressure spring 115 is lowered through the fluid 131 or the elastic body 133 between the upper portion of the upper spring disc 116 and the spring housing 117. It is possible to actively respond to the set pressure by assisting in being able to generate a normal pressing force.

For example, when the safety valve 100 is initially installed, only the pressure spring 115 may be used to cope with the set pressure. During the initial installation, the pressure is set using the pressure spring 115 and the auxiliary pressure means 130 at the same time. It may be possible to respond to, and the initial pressure of the auxiliary spring means 130 when the elasticity of the pressurized spring 115 decreases with time after the pressure is set only with the pressurized spring 115. It can be implemented in various ways, such as to support the value to respond to the set pressure.

In the case of the centralized holding means 150, when the stem 113 and the disk 111 are arranged in a straight line with respect to the axis center of the safety valve 100, the force of the stem 113 is normally applied to the disk 111. Since it is transmitted, no big problem will occur.

However, even if there is an arrangement in which either the disk 111 or the stem 113 does not coincide with the axis center of the safety valve 100, it is formed to be recessed upward on the bottom surface of the inner diameter portion of the disk 111. Since the ball 155 is interposed between the lower ball groove 151 and the upper ball groove 152 that is formed to be recessed downward in the lower end of the stem head 112, the force of the stem 113 is always through the ball 115. Since the force is concentrated in the direction of the center of the safety valve 100 and transmitted to the disc 111, the lower end of the disc 111 is normally blocked at the upper end of the overpressure passage 107.

According to the present invention as described above, it is possible to continuously maintain a qualitative state even when there is a decrease in elasticity of the pressurized spring in response to the set pressure, and even if the arrangement of the stem and the disc is shifted with respect to the axis center, the desk is in contact with the overpressure passage. It has the advantage of improving the quality and durability of the safety valve while excluding concerns about possible safety accidents by providing a function to block through normal connection.

100; Safety valve 102 for hydrogen stations; Lower body
103; Upper Body 105; Adjust
106; Entrance 107; Overpressure passage
108; Discharge hole 109; Dask House
110; Exit 111; disk
112; Stemhead 113; Stem
114; Lower spring disc 115; Pressurized spring
116; Upper spring disc 117; Spring housing
118; Spring adjuster 130; Auxiliary pressure means
131; Fluid 132; Fluid housing
133; Elastic body 150; Concentrated maintenance
151; Lower ball groove 152; Upper ball groove
155; ball

Claims (3)

The overpressure passage 107 formed in the center of the inlet 106 and the inlet 106 where the overpressure can be introduced into the coupling hole with the coupling hole 101 downward, and a plurality of discharges on the upper portion of the overpressure passage 107 A lower body 102 that combines the disk housing 109 forming the ball 108;
An upper body 103 coupled to the lower body 102 by forming an outlet 110 on one side so as to discharge the overpressure discharged through the discharge hole 108 on one side into the atmosphere;
The disc 111 is inserted into the disc housing 109 to open and close the upper end of the overpressure passage 107, and the stem 113 is inserted into the disc 111 and the stem 113 is erected in the axial center direction. A lower spring disc 114, a pressurizing spring 115, and an upper spring disc 116 are sequentially arranged on an upper portion of the stem head 112, and the upper spring disc 116 is a spring coupled to the upper body 103 Safety for a hydrogen charging station consisting of an adjuster (105) coupled to the upper side of the upper body (103) to adjust the force to press the disk (111) by a spring adjuster (118) screwed to the top of the housing (117) In the valve 100;
An auxiliary pressing means 130 capable of adding a pressing force to the pressing spring 115 on the upper portion of the upper spring disc 116;
Between the stem head 112 and the disc 111, the axis of the safety valve 100 is always applied when the force of the pressure spring 115 and the auxiliary pressing means 130 is transmitted to the disc 111 through the stem 113 Safety valve for a hydrogen charging station, characterized in that it further comprises a concentration holding means 150 that can be concentrated in the central direction. According to claim 1;
The auxiliary pressing means 130 is filled with the fluid 131 in the space between the upper portion of the upper spring disc 116 and the spring housing 117 or the elastic body 133 is built-in, so that the pressing force of the pressing spring 115 is applied. A safety valve for a hydrogen charging station, characterized in that it is capable of continuously maintaining a set pressure by assisting in deterioration. According to claim 1;
The centralized holding means 150 includes a lower ball groove 151 which is formed to be recessed downward at the center position of the inner bottom surface of the disc 111;
An upper ball groove (152) formed to be recessed upwardly in the center of the bottom surface of the stem head (112) for pressing the disk (111);
The ball which is transmitted through the lower and upper ball grooves 151 and 152 through which the force of the stem 113 is transmitted to the shaft center of the disc 111 even though the shaft 111 and the stem 113 do not match the shaft center. 155), characterized in that it comprises a safety valve for a hydrogen charging station.

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