Relief valve for hydrogen supply line that limits the movement width of the pressure spring

Abstract

The present invention relates to a relief valve for a hydrogen supply line that limits the range of movement of a pressure spring, and is installed in a supply line of a tank that is filled with hydrogen to ensure safety by rapidly discharging the pressure to the outside when the pressure inside the supply line exceeds a set pressure. In order to ensure that the relief valve operates accurately when the pressure in the hydrogen supply line exceeds a set value by limiting the range of movement of the pressure spring used in the relief valve so as to maintain the elastic modulus of the pressure spring, the invention comprises: a lower body (10) having an inlet (19) through which overpressure can be introduced and an overpressure passage (11) formed through the path of the overpressure through the inlet (19); and a disc housing (20) coupled to the upper side of the overpressure passage (11) and having a discharge hole (21) formed in a direction perpendicular to the overpressure passage (11). An upper body (30) coupled to the upper side of the lower body (10) and having an outlet (31) formed on one side to discharge the overpressure discharged through the discharge hole (21); a disc (40) that opens and closes the upper part of the overpressure passage (11) while inserting a stem head (48) coupled with a stem (47); a spring housing (50) that accommodates a lower spring disc (51), a pressure spring (59), and an upper spring disc (55) sequentially coupled to the upper side of the stem head (48); a spring adjuster (60) that is screw-coupled to the upper side of the spring housing (50) to adjust the force with which the pressure spring (59) presses the disc (40); and an intermittent nut (75) provided on the upper side of the spring housing (50) and coupled to the first male screw portion (61) of the spring adjuster (60). A cap (70) provided on the upper side of the above-mentioned stop nut (75) and coupled to the male screw portion (61) of the spring adjuster (60) to finish the upper side of the spring housing (50);The lower spring disc (51) and the upper spring disc (55) are each formed with seating grooves (52, 56) facing each other in opposite directions so that both ends of the pressure spring (59) are inserted and seated therein, the lower spring disc (51) is seated and supported on the upper side of the stem head (48), and the upper spring disc (55) is coupled and supported to a second male screw portion (62) formed at the end of the spring adjuster (60), wherein the lower spring disc (51) and the upper spring disc (55) are spaced apart from each other, and a stopper (81) is inserted from the outside to the inside of the spring housing (50) where the lower spring disc (51) is located, positioned parallel to the upper surface of the lower spring disc (51), so that within the disc (40) by the overpressure transmitted through the overpressure passage (11). When the inserted stem head (48) rises and presses the lower spring disc (51) upward, the lower spring disc (51) is configured to move upward in a limited manner within the gap (W) spaced apart between the lower spring disc (51) and the stopper (81), thereby preventing the elastic modulus of the pressure spring (59) from changing and maintaining the elastic modulus of the pressure spring (59).

Description

Technology Field

[0001] The present invention relates to a relief valve for a hydrogen supply line that limits the range of movement of a pressure spring, and more specifically, to a relief valve for a hydrogen supply line that limits the range of movement of a pressure spring used in the relief valve so that the pressure in the hydrogen supply line can operate accurately when the pressure in the supply line exceeds a set value, by limiting the range of movement of the pressure spring used in the relief valve to maintain the elastic modulus of the pressure spring, thereby ensuring safety by rapidly discharging the pressure to the outside when the pressure inside the supply line exceeds a set pressure. Background Technology

[0002] In fuel cell systems, high-purity hydrogen is supplied from a hydrogen storage tank to a fuel cell through a hydrogen supply device, and this hydrogen supply device is equipped with a relief valve to regulate the increased pressure when the supply pressure of the hydrogen supplied to the fuel cell through the hydrogen supply line rises excessively.

[0003] Figure 1 is a cross-sectional view of a conventional relief valve.

[0004] As described above, the device comprises a valve housing (110) that is screw-coupled to a manifold (3) on a hydrogen supply line and forms a valve passage (111), a poppet (150) mounted in the valve passage (111), and a valve spring (170) mounted to the poppet (150) in the valve passage (111).

[0005] The valve spring (170) is in contact with the inner wall surface of the valve housing (110) and exerts elastic force on the poppet (150) while being supported on the inner upper surface of the valve housing (110) and the poppet (150).

[0006] Accordingly, the above relief valve according to the prior art is known to have a configuration in which, when the hydrogen supply pressure of the hydrogen supply line rises excessively above a reference value, the poppet (150) rises by overcoming the elastic force of the valve spring (170) due to the pressure of hydrogen, and thereby opens the valve passage (111) of the valve housing (110), so that the hydrogen supplied along the hydrogen supply line is discharged through the valve passage (111), thereby lowering the hydrogen supply pressure.

[0007] However, since the above relief valve relies on a spring, after a considerable period of time, the spring's elasticity modulus is not the same as the initial one and the force weakens, so it cannot continuously maintain the force corresponding to the pressure set at the initial level, and thus there was a problem where the valve opened even though the pressure in the hydrogen supply line was below the set value. Prior art literature

[0008] Published Patent Application No. 10-2011-0138982 The problem to be solved

[0009] Accordingly, the present invention was devised to eliminate the aforementioned problems, and focuses on a relief valve for a hydrogen supply line that limits the range of movement of a pressure spring used in the relief valve to ensure safety by rapidly discharging the pressure inside the supply line to the outside when the pressure exceeds a set pressure, thereby maintaining the elastic modulus of the pressure spring, so that the relief valve can operate accurately when the pressure in the hydrogen supply line exceeds a set value. means of solving the problem

[0010] The present invention for achieving the above technical objective comprises: a lower body (10) having an inlet (19) through which overpressure can be introduced and an overpressure passage (11) formed through the path of the overpressure through the inlet (19); a disk housing (20) coupled to the upper side of the overpressure passage (11) and having a discharge hole (21) formed in a direction perpendicular to the overpressure passage (11); an upper body (30) coupled to the upper side of the lower body (10) and having an outlet (31) formed on one side to discharge the overpressure discharged through the discharge hole (21); and a disk (40) that opens and closes the upper part of the overpressure passage (11) while inserting a stem head (48) coupled with a stem (47). A spring housing (50) that accommodates a lower spring disc (51) sequentially coupled to the upper side of the stem head (48), a pressure spring (59), and an upper spring disc (55); a spring adjuster (60) that is screw-coupled to the upper side of the spring housing (50) to adjust the force with which the pressure spring (59) presses the disc (40); a stop nut (75) provided on the upper side of the spring housing (50) and coupled to the first male screw portion (61) of the spring adjuster (60); and a cap (70) provided on the upper side of the stop nut (75) and coupled to the male screw portion (61) of the spring adjuster (60) to close the upper side of the spring housing (50).The lower spring disc (51) and the upper spring disc (55) are each formed with seating grooves (52, 56) facing each other in opposite directions so that both ends of the pressure spring (59) are inserted and seated therein, the lower spring disc (51) is seated and supported on the upper side of the stem head (48), and the upper spring disc (55) is coupled and supported to a second male screw portion (62) formed at the end of the spring adjuster (60), and the lower spring disc (51) and the upper spring disc (55) are spaced apart from each other, and a stopper (81) is inserted from the outside to the inside of the spring housing (50) where the lower spring disc (51) is located, positioned parallel to the upper surface of the lower spring disc (51), so that within the disc (40) by the overpressure transmitted through the overpressure passage (11). When the inserted stem head (48) rises and presses the lower spring disk (51) upward, the lower spring disk (51) is configured to move upward in a limited manner within the spaced interval (W) between the lower spring disk (51) and the stopper (81) to prevent the elastic modulus of the pressure spring (59) from fluctuating, thereby maintaining the elastic modulus of the pressure spring (59). Additionally, an expansion member (87) with an expanded diameter is provided on the outer circumference spaced apart from the end of the stopper (81), so that the stopper (81) is moved inward into the spring housing (50) and the expansion member (87) is positioned parallel to the upper surface of the lower spring disk (51), thereby reducing the spaced interval (W) between the spring disk (51) and the stopper (81) and reducing the travel distance of the lower spring disk (51). A relief valve for a hydrogen supply line that limits the range of movement of a pressure spring, characterized by being configured to be adjustable.

[0011] delete

[0012] In addition, the invention is characterized by having 4 to 8 overpressure auxiliary passages (15) formed radially around the overpressure passage (11) formed on the lower body (10), each having a second diameter (D2) that is 0.2 to 0.5 times larger than the first diameter (D1) of the overpressure passage (11). Effects of the invention

[0013] According to the present invention described above, in order to ensure safety by rapidly discharging the pressure inside the supply line to the outside when the pressure exceeds the set pressure, the movement range of the pressure spring used in the relief valve is limited so that the elastic modulus of the pressure spring is maintained, thereby enabling the relief valve to operate accurately when the pressure in the hydrogen supply line exceeds the set value. Brief explanation of the drawing

[0014] FIG. 1 is a cross-sectional view of a conventional relief valve. FIG. 2 is an exemplary cross-sectional view of a relief valve for a hydrogen supply line according to the present invention. FIGS. 3 and 4 are exemplary diagrams of the operation of a relief valve for a hydrogen supply line according to the present invention. FIG. 5 is an exemplary diagram of a modified embodiment according to the present invention. FIG. 6 is an enlarged exemplary embodiment of a lower body according to the present invention. Specific details for implementing the invention

[0015] The specific details for implementing the present invention will be explained in more detail below with reference to the attached drawings.

[0016] The present invention relates to a relief valve for a hydrogen supply line that limits the movement range of a pressure spring used in a relief valve, which is installed in the supply line of a tank that is filling hydrogen, so as to ensure safety by rapidly discharging the pressure inside the supply line to the outside when the pressure exceeds a set pressure, thereby maintaining the elastic modulus of the pressure spring, so that the relief valve can operate accurately when the pressure in the hydrogen supply line exceeds a set value. Referring to FIGS. 2 to 6, the relief valve comprises a lower body (10), a disc housing (20), an upper body (30), a disc (40), a lower spring disc (51), a pressure spring (59), an upper spring disc (55), a spring housing (50), a spring adjuster (60), a stopper nut (75), a cap (70), and a stopper (81).

[0017] To implement a relief valve for a hydrogen supply line that limits the range of movement of a pressure spring according to the present invention, a lower body (10) is first provided as shown in FIG. 2. The lower body (10) has a coupling member (17) with a male thread formed therein on the lower side, and an inlet (19) through which overpressure can be introduced is formed, and an overpressure passage (11) is formed through the center of the inlet (19) on the path of overpressure through the inlet (19).

[0018] The above-mentioned overpressure passage (11) may be formed only on the central side of the inlet (19), but in order to increase the amount of overpressure flowing in and to transmit the moving overpressure more finely to the lower surface of the disk (40) described later, the overpressure auxiliary passage (15) is further formed radially around the overpressure passage (11) formed on the lower body (10) as shown in FIG. 6.

[0019] At this time, it is preferable to form 4 to 8 overpressure auxiliary passages (15) radially around the overpressure passage (11), each having a second diameter (D2) that is 0.2 to 0.5 times the first diameter (D1) of the overpressure passage (11). The overpressure auxiliary passages (15) transmit overpressure to the lower edge of the disk (40), thereby allowing the force to raise the disk (40) to be generated more finely.

[0020] In addition, an outwardly expanding slope (12) is formed on the outer edge of the overpressure passage (11), and an outwardly expanding slope (16) is also formed on the outer edge of the overpressure auxiliary passage (15), and the two outwardly expanding slopes (12, 16) meet to form a mountain shape, thereby configuring the system so that the inflow of overpressure is smooth.

[0021] Meanwhile, as shown in FIG. 2, a disk housing (20) is screw-coupled to the upper side of the overpressure passage (11), having a plurality of discharge holes (21) formed in a direction perpendicular to the overpressure passage (11).

[0022] And, on the upper side of the lower body (10), an upper body (30) is provided with an outlet (31) formed on one side to discharge the excess pressure discharged through the discharge hole (21) into the atmosphere.

[0023] A stem head (48) is inserted into the disc (40) that opens and closes the upper part of the above-mentioned overpressure passage (11), and a stem (47) that stands upright in the axial direction is coupled thereto.

[0024] Additionally, a lower spring disc (51), a pressure spring (59), and an upper spring disc (55) are arranged sequentially on the upper side of the stem head (48), and a spring housing (50) that accommodates the lower spring disc (51), the pressure spring (59), and the upper spring disc (55) is provided.

[0025] In addition, a spring adjuster (60) is provided that is screw-coupled to the upper side of the spring housing (50) to adjust the force with which the pressure spring (59) presses the disk (40).

[0026] Additionally, an intermittent nut (75) is provided on the upper side of the spring housing (50) to be coupled to the first male screw portion (61) of the spring adjuster (60), and a cap (70) is provided on the upper side of the intermittent nut (75) to be coupled to the male screw portion (61) of the spring adjuster (60) and to close the upper side of the spring housing (50), so that the spring housing (50) can be closed with the cap (70) to continuously maintain the adjusted state.

[0027] Meanwhile, as a more detailed description of the present invention, as shown in FIGS. 2 and 3, the lower spring disc (51) and the upper spring disc (55) are configured such that seating grooves (52, 56) are formed facing each other in a direction such that both ends of the pressure spring (59) are inserted and seated, thereby enabling the pressure spring (59) to be stably inserted and seated within the facing seating grooves (52, 56).

[0028] The lower spring disc (51) is supported on the upper side of the stem head (48), and the upper spring disc (55) is supported by being coupled to the second male screw portion (62) formed at the end of the spring adjuster (60). The lower spring disc (51) and the upper spring disc (55) are spaced apart from each other, and a stopper (81) is inserted from the outside to the inside of the spring housing (50) where the lower spring disc (51) is located, so as to be positioned parallel to the upper surface of the lower spring disc (51). When the stem head (48) inserted into the disc (40) rises due to the overpressure transmitted through the overpressure passage (11) and presses the lower spring disc (51) upward, the lower spring disc (51) is within the spaced interval (W) between the lower spring disc (51) and the stopper (81). It is configured so that the elastic modulus of the pressure spring (59) is maintained by preventing the elastic modulus of the pressure spring (59) from changing by allowing it to move upward in a limited manner.

[0029] At this time, the above gap (W) is formed to be 0.3 to 0.5 times the diameter of the pressure spring (59) to minimize the variation range of the elastic modulus of the pressure spring (59), and the stopper (81) may be formed in a shape that can slide in the horizontal direction, and may be configured to move horizontally while rotating by forming it in a screw shape.

[0030] Looking at the operational relationship according to the above configuration, when the pressure spring (59) determines the force pushing the stem (47) according to the set pressure, the force is transmitted to the disc (40) through the stem head (48) of the stem (47), so that the lower part of the disc (40) is continuously maintained in close contact with the upper part of the overpressure passage (11). Therefore, when the pressure inside the filling tank is below the set value, the pressure cannot push up the disc (40), so the relief valve does not open.

[0031] In this state, if overpressure occurs inside the hydrogen supply line and exceeds the set value, force is transmitted to the overpressure passage (11) through the inlet (19), and this force overcomes the force of the pressure spring (59) pressing the disk (40), so that the disk (40) pushes up the stem (47) and the pressure spring (59), thereby opening the overpressure passage (11) and releasing pressure to the outlet (31) through the discharge hole (21) formed in the disk housing (20), thus preventing the hydrogen supply line from being damaged by overpressure.

[0032] At this time, since the pressure spring (59) is elastically operated only within the gap (W) formed between the mutually spaced lower spring disc (51) and stopper (81), that is, since it moves upward in a limited manner, it prevents the elastic modulus of the pressure spring (59) from changing, and accordingly, the elastic modulus of the pressure spring (59) can be maintained.

[0033] Meanwhile, as a modified embodiment of the present invention, as shown in FIG. 5, an expansion member (87) with an expanded diameter is provided on the outer circumference spaced apart from the end of the stopper (81), and the stopper (81) is moved into the inner side of the spring housing (50) so that the expansion member (87) is positioned parallel to the upper surface of the lower spring disk (51), thereby reducing the spaced-apart gap (W) between the spring disk (51) and the stopper (81), so that the travel distance of the lower spring disk (51) can be reduced and adjusted.

[0034] On the other hand, as a modified embodiment of the present invention, as shown in FIG. 2, an adjustment bolt (71) is provided at the center of the upper side of the cap (70) so that a male screw portion (72) is positioned inside the cap (70), and a support plate (74) is fixed to the lower end of the male screw portion (72) to be closely supported on the upper end of the spring adjustment member (60).

[0035] According to this configuration, when the elasticity coefficient of the pressure spring (59) changes and adjustment is required, the adjustment bolt (71) is rotated downward to lower the upper spring disc (55) connected to the lower side of the spring adjustment member (60), thereby adjusting the elasticity coefficient of the pressure spring (59).

[0036] According to the relief valve for a hydrogen supply line that limits the range of movement of a pressure spring of the present invention as described above, when installed in a supply line of a tank that is filled with hydrogen, the pressure inside the supply line is quickly discharged to the outside to ensure safety when the pressure exceeds a set pressure, the range of movement of the pressure spring used in the relief valve is limited so that the elastic modulus of the pressure spring is maintained, thereby enabling the relief valve to operate accurately when the pressure in the hydrogen supply line exceeds a set value.

[0037] The present invention described above has been explained with reference to an exemplary embodiment illustrated in the drawings, but this is merely illustrative, and it should be made clear to those skilled in the art that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be interpreted by the appended claims, and all technical ideas within an equivalent scope should be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0039] 10: Lower body 11: Overpressure channel 19 : Entrance 20 : Disc housing 21 : Release hole 30 : Upper body 31 : Exit 40 : Disc 47 : Stem 48 : Stem head 50 : Spring housing 51 : Lower spring disc 55 : Upper spring disc 59 : Pressure spring 60: Spring adjuster 61: First male screw part 62 : Second male thread section 70 : Cap 75 : Interruption nut 81 : Stopper

Claims

Claim 1 A lower body (10) having an inlet (19) through which overpressure can be introduced and an overpressure passage (11) formed through the path of the overpressure through the inlet (19); a disk housing (20) coupled to the upper side of the overpressure passage (11) and having a discharge hole (21) formed in a direction perpendicular to the overpressure passage (11); an upper body (30) coupled to the upper side of the lower body (10) and having an outlet (31) formed on one side to discharge the overpressure discharged through the discharge hole (21); a disk (40) that opens and closes the upper part of the overpressure passage (11) while inserting a stem head (48) coupled with a stem (47); and a lower spring disk (51), a pressure spring (59), and an upper spring disk (55) that are sequentially coupled to the upper side of the stem head (48). A spring housing (50); a spring adjuster (60) screw-coupled to the upper side of the spring housing (50) to adjust the force with which a pressure spring (59) presses against a disc (40); a stop nut (75) provided on the upper side of the spring housing (50) and coupled to a first male screw portion (61) of the spring adjuster (60); and a cap (70) provided on the upper side of the stop nut (75) and coupled to a male screw portion (61) of the spring adjuster (60) to close the upper side of the spring housing (50).The lower spring disc (51) and the upper spring disc (55) are each formed with seating grooves (52, 56) facing each other in opposite directions so that both ends of the pressure spring (59) are inserted and seated therein, the lower spring disc (51) is seated and supported on the upper side of the stem head (48), and the upper spring disc (55) is coupled and supported to a second male screw portion (62) formed at the end of the spring adjuster (60), and the lower spring disc (51) and the upper spring disc (55) are spaced apart from each other, and a stopper (81) is inserted from the outside to the inside of the spring housing (50) where the lower spring disc (51) is located, positioned parallel to the upper surface of the lower spring disc (51), so that the inside of the disc (40) is subjected to overpressure transmitted through the overpressure passage (11). When the inserted stem head (48) rises and presses the lower spring disk (51) upward, the lower spring disk (51) is configured to move upward in a limited manner within the spaced interval (W) between the lower spring disk (51) and the stopper (81) to prevent the elastic modulus of the pressure spring (59) from fluctuating, thereby maintaining the elastic modulus of the pressure spring (59). Additionally, an expansion member (87) with an expanded diameter is provided on the outer circumference spaced apart from the end of the stopper (81), so that the stopper (81) is moved inward into the spring housing (50) and the expansion member (87) is positioned parallel to the upper surface of the lower spring disk (51), thereby reducing the spaced interval (W) between the spring disk (51) and the stopper (81) and reducing the travel distance of the lower spring disk (51). A relief valve for a hydrogen supply line that limits the range of movement of a pressure spring, characterized by being configured to be adjustable. Claim 2 delete Claim 3 delete Claim 4 A relief valve for a hydrogen supply line that limits the movement range of a pressure spring, characterized in that, in claim 1, 4 to 8 overpressure auxiliary passages (15) are formed radially around an overpressure passage (11) formed on the lower body (10), each having a second diameter (D2) that is 0.2 to 0.5 times larger than the first diameter (D1) of the overpressure passage (11).

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