Gas injector for injecting gaseous hydrogen

Abstract

The present invention relates to a gas injector (1) for injecting gaseous hydrogen, in particular for a hydrogen internal combustion engine or a hydrogen fuel cell. The gas injector (1) comprises an inlet (2) for introducing gaseous hydrogen into the gas injector (1), a closure element (3), an actuator (4) for actuating the closure element (3), and a valve seat (5) having at least one through opening (50). The closure element (3) is configured to open and close the at least one through opening (50). The gas injector (1) furthermore comprises a sealing element (6), which is arranged at an end region (7) of the gas injector (1) facing away from the inlet and is configured to seal gaseous hydrogen. The invention also relates to a device having such a gas injector (1).

Description

[0001] Description

[0002] title

[0003] Gas injector for injecting gaseous hydrogen

[0004] State of the art

[0005] The present invention relates to a gas injector for injecting gaseous hydrogen, in particular for a hydrogen internal combustion engine and / or a hydrogen fuel cell.

[0006] Gas injectors are known in various designs from the prior art. When using known gas injectors with gaseous hydrogen, sealing against a fuel inlet of a device, such as a hydrogen internal combustion engine or a hydrogen fuel cell, can be problematic, particularly due to the pressure prevailing in the fuel inlet and / or the material resistance of the sealing elements used for sealing.

[0007] Disclosure of the invention

[0008] The gas injector according to the invention for injecting gaseous hydrogen, in particular for a hydrogen internal combustion engine or hydrogen fuel cell, has the advantages of a good seal between the gas injector and a fuel inlet of the hydrogen internal combustion engine or hydrogen fuel cell, as well as of external leakage and good permeation resistance at high temperatures. This is achieved by providing a sealing element arranged at an end region of the gas injector facing away from a gas injector inlet and designed to seal off gaseous hydrogen.The gas injector for injecting gaseous hydrogen, in particular for a hydrogen internal combustion engine or hydrogen fuel cell, comprises an inlet for introducing gaseous hydrogen into the gas injector, a closing element, an actuator for actuating the closing element, a valve seat with at least one through-opening, and the sealing element, which is arranged at the end region of the gas injector facing away from the inlet and is designed to seal off gaseous hydrogen. The closing element is designed to open and close the at least one through-opening. The sealing element can seal the gas injector against the pressure in a fuel inlet of a device on which the gas injector is arranged, in particular in the event of backfiring in a hydrogen internal combustion engine.It should be noted that the end region facing away from the inlet corresponds in particular to the end region of the gas injector facing the fuel inlet of the device.

[0009] The subclaims show preferred developments of the invention.

[0010] The sealing element is preferably made of a fluoroelastomer, in particular fluororubber (FKM). Thus, the sealing element exhibits good cold stability and good sealing behavior at low temperatures. In particular, temperatures below 0 degrees Celsius, preferably below minus 10 degrees Celsius, further preferably below minus 20 degrees Celsius, further preferably below minus 40 degrees Celsius can be understood as low temperatures.

[0011] The sealing element is preferably sleeve-shaped. Thus, the sealing element can be long enough to achieve efficient sealing of gaseous hydrogen. In particular, the sealing element surrounds the gas injector, in particular the end region of the gas injector. Within the scope of the present invention, a sleeve can preferably be understood as an element, in particular an elongated element, which comprises a preferably central, through-opening and a preferably rotationally symmetrical casing body having the through-opening. The sealing element is in particular designed as a grommet. An O-ring is not to be understood as a sleeve within the scope of the invention.

[0012] Preferably, the sealing element has a funnel-like end.

[0013] The sealing element preferably has a first protruding sealing region and a second protruding sealing region. The first protruding sealing region and the second protruding sealing region provide a first sealing point and a second sealing point in the assembled state of the gas injector in a device, which leads to improved sealing. The first sealing region and / or the second sealing region preferably extend in the circumferential direction of the sealing element, in particular over 360 degrees. In particular, the first sealing region and / or the second sealing region is / are rotationally symmetrical. The second protruding sealing region is preferably arranged directly at the funnel-like end of the sealing element.

[0014] The sealing element preferably covers an end of a valve housing of the gas injector facing away from the inlet. This enables secure attachment of the sealing element to the valve housing. For this purpose, the sealing element preferably has a shoulder. The sealing element preferably has a recess in an inner surface of the sealing element. The end of the valve housing facing away from the inlet is arranged in the recess. The recess preferably extends in the circumferential direction of the sealing element, in particular over 360 degrees. In particular, the recess is rotationally symmetrical. In particular, the valve housing can be designed as a valve sleeve.

[0015] Preferably, the sealing element can be fixed to a valve housing of the gas injector. In particular, the actuator can be a magnetic actuator and have a magnetic coil arranged in the valve housing.

[0016] The valve housing is preferably designed as a magnet housing, in particular as a magnet pot. The valve housing advantageously ensures a magnetic return path for the actuator, which is designed as a magnetic actuator.

[0017] Preferably, the valve housing has a shoulder-shaped region against which the sealing element rests. In particular, a surface of the sealing element facing the inlet rests against the shoulder-shaped region of the valve housing.

[0018] The actuator preferably has an armature, in particular a magnetic armature. The closing element is advantageously attached to the armature and can thus be moved as a unit with the armature. By moving the armature, the closing element can open or close the at least one through-opening. The armature can preferably be made of a ferritic chromium steel, in particular X12CrS13, which is nitrided and carbon-coated. This armature configuration can be used in particular in a gas injector for a hydrogen internal combustion engine. Alternatively, the armature can be made of a ferritic chromium steel, in particular X3CrNb17, which is carbon-coated and chromium-plated. This armature configuration can be used in particular in a gas injector for a hydrogen fuel cell. The proposed armature exhibits good corrosion resistance.

[0019] According to an advantageous embodiment, the actuator can be a magnetic actuator and have an inner pole. The inner pole is configured to move the armature to which the closing element is attached. Preferably, the armature is lifted by the inner pole to expose the at least one through-opening. For this purpose, the magnetic coil is preferably energized, thereby generating a magnetic force in the inner pole.

[0020] The inner pole can preferably be made of a ferritic chromium steel. The ferritic chromium steel can in particular be X3CrNb17. This configuration of the inner pole can be particularly advantageous for a gas injector of a hydrogen fuel cell. The ferritic chromium steel can preferably be nitrided. In particular, the ferritic chromium steel can be X12CrS13. This configuration of the inner pole can be used in particular for a gas injector for a hydrogen internal combustion engine. By manufacturing the inner pole from a ferritic chromium steel, good corrosion resistance of the inner pole can be achieved.

[0021] The closing element preferably comprises a seal carrier and an elastomer arranged on the seal carrier. The elastomer is in particular vulcanized onto the seal carrier. The closing element can be used to achieve a good seal when the gas injector or the at least one through-opening is closed. This is achieved in particular by pressing the elastomer against a sealing lip formed on the at least one through-opening. The closing element can preferably be designed as a sealing disc. Within the scope of the present invention, the closing element and the armature can be referred to as a valve needle.

[0022] The seal carrier can preferably be made of a martensitic chromium steel, in particular X46Cr13. The elastomer can preferably be made of a soft rubber. This material selection for the seal carrier and the elastomer offers the advantage of an improved bond between the seal carrier and the elastomer.

[0023] The valve seat is preferably made of an austenitic chromium-nickel steel, in particular X4CrNi18-12. Furthermore, a surface of the valve seat facing the closing element can preferably be mechanically surface-treated by means of fine machining, in particular polished and / or ground smooth and / or tumbling® and / or deburred using centrifugal force. Thus, surface defects are eliminated, which leads to a reduction in valve seat leakage and an improvement in the flow quality of the gaseous hydrogen.

[0024] The gas injector preferably further comprises a valve seat housing in which the valve seat is arranged. The valve seat is preferably fastened to the valve seat housing, in particular welded. The valve seat housing advantageously provides a guide surface for guiding the closing element and in particular also the armature. Furthermore, the inner pole can preferably be fixed to the valve seat housing. Furthermore, the valve seat housing can advantageously be configured to support a filter for filtering gaseous hydrogen. The valve seat housing is preferably designed as a sleeve and can thus be referred to as a valve seat sleeve in this embodiment.

[0025] The valve seat housing is preferably made of a ferritic chromium steel that is stabilized with titanium. Thus, the valve seat housing has good corrosion resistance. In particular, the valve seat housing can be made of X3CrTi17.

[0026] Preferably, the valve seat housing can be heat-treated, in particular by means of a partial annealing process. This allows the inner pole to be pressed into the valve seat housing without causing cracks in the valve seat housing and, in particular, ensuring that the valve seat housing remains round. The annealing should preferably be neither too intense nor too weak.

[0027] Furthermore, the gas injector preferably comprises a return spring which is configured to return the closing element to a closed state after the at least one through-opening has been released. In the closed state of the return spring, the at least one through-opening is closed. Preferably, a central region of the return spring has a smaller diameter than the end regions of the return spring. In other words, the return spring is preferably designed as a waisted spring. Preferably, the return spring is made of an austenitic chromium-nickel steel, in particular of XIOCrNi 18-8. This makes the return spring particularly suitable for a hydrogen gas injector. Furthermore, wear of the return spring can be reduced or avoided, whereby valve seat leakage can also be reduced.

[0028] Preferably, the gas injector further comprises an adjusting sleeve for axially positioning the return spring. The adjusting sleeve is preferably pressed into the inner pole. The return spring is preferably supported and tensioned by the actuator's armature and / or the adjusting sleeve.

[0029] Furthermore, the gas injector preferably comprises an O-ring arranged at an inlet-side end region of the gas injector. The O-ring serves as a sealing ring (O-shaped sealing ring). The O-ring is preferably made of a fluoroelastomer, in particular fluororubber (FKM). Due to this choice of material, the O-ring has low permeability and thus improved permeation behavior at high temperatures, in particular at a temperature of at least 100 degrees Celsius, preferably at least 125 degrees Celsius, further preferably at least 135°C, further preferably at least 140°C. The O-ring advantageously serves to seal the gas injector against a fuel distributor (fuel rail), via which gaseous hydrogen can be introduced into the gas injector.

[0030] The gas injector preferably further comprises a strainer basket filter for filtering the gaseous hydrogen. The strainer basket filter serves to filter out particles in the gaseous hydrogen that, due to their size, could cause blockages or damage in the gas injector. This ensures that the required volume of hydrogen flows through the gas injector, that individual parts in the gas injector do not jam due to the particles, and that seat leakage is reduced. The strainer basket filter has, in particular, a strainer, a frame, and a clamping ring. The strainer is arranged on the frame, wherein the strainer basket filter can be fastened to a component of the gas injector via the clamping ring. The strainer basket filter is arranged in a flow opening of the gas injector. The strainer basket filter is preferably fastened to a sleeve, in particular an extension sleeve, of the gas injector.

[0031] The sieve is preferably made of stainless steel, more preferably an austenitic chromium-nickel steel, in particular X4CrNi 18-10 or X2CrNi19-11. The material X4CrNi18-10 can be used in particular in a gas injector for a hydrogen internal combustion engine, and the material X2CrNi19-11 in a gas injector for a hydrogen fuel cell. The frame is preferably made of a glass fiber reinforced plastic, in particular PPS. For example, the material Fortran® 1140L4 can be used for the frame of the strainer basket filter. The clamping ring is preferably made of stainless steel, preferably an austenitic chromium-nickel steel, in particular X4CrNi18-12. This choice of material for the various components of the strainer basket filter enables the strainer basket filter to withstand high pressures of gaseous hydrogen.

[0032] The present invention further relates to a device with a previously described gas injector. The device can, in particular, be a hydrogen internal combustion engine or a hydrogen fuel cell. The gas injector can preferably be arranged at a fuel inlet, in particular at a fuel inlet manifold, of the device. The gas injector is configured to inject gaseous hydrogen into the fuel inlet. In a hydrogen internal combustion engine, the fuel inlet manifold is arranged, in particular, at a combustion chamber. In a hydrogen fuel cell, the fuel inlet manifold is arranged, in particular, at an anode.

[0033] Brief Description of the Drawings Embodiments of the invention are described in detail below with reference to the accompanying drawings. In the drawing:

[0034] Figure 1 is a simplified schematic sectional view of a

[0035] Device with a gas injector for injecting gaseous hydrogen according to an embodiment of the present invention,

[0036] Figure 2 is a simplified schematic perspective view of the

[0037] Gas injector from Figure 1,

[0038] Figure 3 is a simplified schematic front view of a

[0039] Component of the gas injector from Figure 1, and

[0040] Figure 4 is a simplified schematic sectional view of another

[0041] Component of the gas injector from Figure 1.

[0042] Embodiment of the invention

[0043] A device 1000 with a gas injector 1 for injecting gaseous hydrogen according to an exemplary embodiment of the present invention will be described in detail below with reference to Figures 1 to 4. The device 1000 can, in particular, be a hydrogen internal combustion engine or a hydrogen fuel cell.

[0044] As can be seen from Figure 1, the gas injector 1 is arranged, in particular, at a fuel inlet 1001 of the device 1000 such that hydrogen can be injected into the fuel inlet 1001 by means of the gas injector 1. The fuel inlet 1001 can be designed, in particular, as a fuel inlet manifold. In a hydrogen internal combustion engine, the fuel inlet manifold is arranged at a combustion chamber of the internal combustion engine. In a hydrogen fuel cell, the fuel inlet manifold is arranged at an anode of the fuel cell.

[0045] The gas injector 1 has an inlet 2 for introducing gaseous hydrogen into the gas injector 1, a closing element 3, an actuator 4 for actuating the closing element 3, a valve seat 5 with a plurality of through-openings 50 (in this exemplary embodiment: four through-openings), and a sealing element 6. The closing element 3 is configured to open and close the through-openings 50. When the through-openings 50 are open, hydrogen can be injected; when the through-openings 50 are closed, hydrogen injection is blocked. In particular, the sealing element 6 is configured to seal the gas injector 1 against the fuel inlet 1001.

[0046] The closing element 3, which is designed as a sealing disc, has a seal carrier 30 and an elastomer 31 arranged on the seal carrier 30. The elastomer 31 is, in particular, vulcanized onto the seal carrier 30. The seal carrier 30 is made of a martensitic chromium steel, in particular X46Cr13, with the elastomer 31 being made of a soft rubber. This allows the seal carrier 30 and the elastomer 31 to be securely connected to one another.

[0047] The actuator 4 is designed as a magnetic actuator and has an armature 40, an inner pole 41, a magnetic coil 42, and a valve housing 9. The valve housing 9 is designed as a magnet housing, in particular as a magnet pot, and serves as the magnetic return element of the actuator 4. The magnetic coil 42 is accommodated in the valve housing 9. The magnetic coil 42 is fixed to the valve housing 9, in particular by means of a plastic overmolding.

[0048] The closing element 3 is attached to the armature 40, so that the armature 40 and the closing element 3 can move axially. The armature 40 and the closing element 3 form a valve needle. Moving the valve needle opens or closes the through-openings 50. To open the through-openings 50, the inner pole 41 is configured to lift the armature 40 when the solenoid coil 42 is energized. An electrical plug connection 14 is provided on the side of the gas injector 1 to energize the solenoid coil 42.

[0049] In particular, if the device 1000 is a hydrogen internal combustion engine, the armature 40 can be formed from a ferritic chromium steel, in particular X12CrS13, which is nitrided and carbon-coated. In particular, if the device 1000 is a hydrogen fuel cell, the armature 40 can be formed from a ferritic chromium steel, in particular X3CrNb17, which is carbon-coated and chromium-plated. Thus, the armature 40 has good corrosion resistance.

[0050] The inner pole 41 can be formed from a ferritic chromium steel, particularly in a gas injector 1 for a hydrogen fuel cell. The ferritic chromium steel can be X3CrNb17. Particularly when the gas injector 1 is intended for a hydrogen internal combustion engine, the inner pole 41 can be made from a nitrided ferritic chromium steel. X12CrS13 can be used for this purpose. Manufacturing the inner pole 41 from a ferritic chromium steel can ensure good corrosion resistance of the inner pole 41.

[0051] To eliminate surface defects of the valve seat 5 and thus reduce valve seat leakage and improve the flow quality of the gaseous hydrogen, the valve seat 5 is made of an austenitic chromium-nickel steel, in particular X4CrNi18-12, and a surface 51 of the valve seat 5 opposite the closing element 3 is mechanically surface-treated by means of fine machining, in particular polished and / or ground smooth and / or tumbling® and / or deburred by centrifugal force. The valve seat 5 is arranged in a valve seat housing 11 of the gas injector 1, which is designed as a sleeve (valve seat sleeve). The valve seat 5 is also fastened to the valve seat housing 11, in particular welded. The valve needle is guided in the valve seat housing 11. In addition, the inner pole 41 is arranged in the valve seat housing 11 and fixed to it. The valve seat housing 11 is further heat-treated, in particular by means of a partial annealing process.Thus, the inner pole 41 can be pressed into the valve seat housing 11 without cracks in the valve seat housing 11 being caused by the pressing process and so that the roundness of the valve seat housing 11 is still ensured.

[0052] The valve seat housing 11 is preferably made of a ferritic chromium steel that is stabilized with titanium. Thus, the valve seat housing 11 has good corrosion resistance. In particular, the valve seat housing 11 can be made of X3CrTi17. As can also be seen from Figures 1 and 2, the sealing element 6 is arranged at an end region 7 of the gas injector 1 facing away from the inlet 2 and is designed to seal off gaseous hydrogen and the intake manifold atmosphere. The sealing element 6 is designed as a sleeve that surrounds the end region 7 and has a funnel-shaped end 60. The funnel-shaped end 60 is an end of the sealing element 6 facing away from the inlet 2 of the gas injector 1. In particular, the sealing element 6 bears partially against the valve seat housing 11 and partially against the valve housing 9.The sealing element 6 is designed such that a surface 65 of the sealing element 6 facing the inlet 2 of the gas injector 1 rests against a shoulder-shaped region 90 of the valve housing 9. The valve seat housing 11 projects axially beyond the end 60 facing away from the inlet 2 of the gas injector 1.

[0053] The sealing element 6 is fastened to the valve housing 9. For this purpose, the sealing element 6 has a recess 63 in an inner surface of the sealing element 6. The sealing element 6 is pressed onto the valve housing such that an end 91 of the valve housing 9 facing away from the inlet 2 of the gas injector 1 is arranged. The end 91 is inclined outwards. The recess 63 extends over 360 degrees in the circumferential direction of the sealing element 6 and is rotationally symmetrical. Furthermore, the sealing element 6 covers the end 91 of the valve housing 9 facing away from the inlet 2 of the gas injector 1 in the radial direction 500 of the gas injector 1. For this purpose, the sealing element 6 has a shoulder 64 in the interior of the sealing element 6.

[0054] In addition, the sealing element 6 has a first protruding sealing region 61 and a second protruding sealing region 62, which provide a first sealing point and a second sealing point in the assembled state of the gas injector 1 in the device 1000. The first sealing region 61 and the second sealing region 62 extend over 360 degrees in the circumferential direction of the sealing element and are rotationally symmetrical. The second protruding sealing region 62 is arranged directly at the funnel-like end 60 of the sealing element 6.

[0055] To achieve good cold stability and good sealing behavior at low temperatures, the sealing element 6 is made of a fluoroelastomer, in particular fluororubber (FKM). As can also be seen from Figures 1 and 3, the gas injector 1 comprises a return spring 10, which is designed to return the closing element 3 to a closed state after the through-openings 50 have been released. In the closed state of the return spring 10, the through-openings 50 are closed. Figure 1 shows the closed state of the return spring 10. In the open state of the return spring 10, the through-openings 50 are released, and gaseous hydrogen can be injected by means of the gas injector 1.

[0056] The return spring 10 is designed as a tapered spring made of an austenitic chromium-nickel steel, in particular X10CrNi18-8. The return spring 10 has, in particular, a central region 100, a first end region 101, and a second end region 102. The central region 100 has a diameter 103 that is smaller than a first diameter 104 of the first end region 101 and smaller than a second diameter 105 of the second end region 102. The first diameter 104 and the second diameter 105 are preferably the same size.

[0057] The return spring 10 is arranged partially in an armature opening 400 and partially in the inner pole 41. A diameter 401 of the armature opening 400 is preferably between 3.70 mm and 3.90 mm, in particular 3.80 mm. A length 402 of the armature opening 400 is preferably between 5.30 mm and 5.50 mm, in particular 5.40 mm.

[0058] The gas injector 1 further comprises an adjusting sleeve 15 for axially positioning the return spring 10. In particular, the return spring 10 is supported and tensioned by means of the armature 40 and the adjusting sleeve 15. The adjusting sleeve 15 is preferably pressed into the inner pole 41.

[0059] The gas injector 1 has a filter for filtering the gaseous hydrogen supplied through the inlet 2. The filter is designed as a strainer basket filter 13 and has a strainer 131, a frame 132, and a clamping ring 133.

[0060] The screen 131 is made of stainless steel, preferably an austenitic chromium-nickel steel, in particular X4CrNi18-10 or X2CrNi19-11. The material X4CrNi18-10 can be used in particular in a gas injector 1 of a hydrogen internal combustion engine, and the material X2CrNi19-11 can be used in a gas injector 1 of a hydrogen fuel cell. The frame 132 is made of a glass-fiber-reinforced plastic. For example, the material Fortran® 1140L4 can be used.

[0061] Furthermore, the clamping ring 133 is made of stainless steel, preferably an austenitic chromium-nickel steel, in particular X4CrNi18-12. Thus, the strainer basket filter 1 can withstand high pressures of gaseous hydrogen.

[0062] Furthermore, the gas injector 1 comprises an O-ring 12, which is arranged at an inlet-side end region 8 of the gas injector 1. The O-ring 12 serves as a sealing ring for sealing the gas injector 1 against a fuel rail through which gaseous hydrogen can be introduced into the gas injector 1. In order to achieve low permeability and thus improved permeation behavior at high temperatures, the O-ring 12 is made of a fluoroelastomer, in particular fluororubber (FKM).

[0063] The O-ring 12 is further arranged on an extension sleeve 16. In other words, the extension sleeve 16 provides a sealing and mounting surface for the O-ring 12. The extension sleeve 16 is connected to the valve seat housing 11, in particular by means of a welded connection, and is surrounded by a plastic overmolding 17. The plastic overmolding 17 also serves to accommodate the electrical plug connection 14 and support the O-ring 12.

[0064] The proposed gas injector 1 has the advantage of a good seal of the gas injector 1 against a fuel inlet 1001 of the device 1000.

Claims

Claims 1 . Gas injector (1) for injecting gaseous hydrogen, in particular for a hydrogen internal combustion engine or a hydrogen fuel cell, comprising: • an inlet (2) for introducing gaseous hydrogen into the gas injector (1), • a locking element (3), • an actuator (4) for actuating the locking element (3), • a valve seat (5) with at least one through-opening (50), wherein the closing element (3) is designed to open and close the at least one through-opening (50), and • a sealing element (6) which is arranged on an end region (7) of the gas injector (1) facing away from the inlet (2) and is designed to seal gaseous hydrogen.

2. Gas injector (1) according to claim 1, wherein the sealing element (6) is made of a fluoroelastomer, in particular fluororubber.

3. Gas injector (1) according to one of the preceding claims, wherein the sealing element (6) is sleeve-shaped.

4. Gas injector (1) according to one of the preceding claims, wherein the sealing element (6) has a funnel-like end (60).

5. Gas injector (1) according to one of the preceding claims, wherein the sealing element (6) has a first protruding sealing region (61) and a second protruding sealing region (62).

6. Gas injector (1) according to one of the preceding claims, wherein the sealing element (6) covers an end (7) of a valve housing (9) of the gas injector (1) facing away from the inlet (2).

7. Gas injector (1) according to one of the preceding claims, wherein the sealing element (6) is fastened to a valve housing (9) of the gas injector (1), in particular wherein the actuator (4) is a magnetic actuator and has a magnetic coil (42) which is arranged in the valve housing (9).

8. Gas injector (1) according to one of the preceding claims, wherein the actuator (4) has an armature (40) which is formed from a ferritic chromium steel, in particular X12CrS13, which is nitrided and carbon-coated, or from a ferritic chromium steel, in particular X3CrNb17, which is carbon-coated and chromium-plated.

9. Gas injector (1) according to one of the preceding claims, wherein the actuator (4) is a magnetic actuator and has an inner pole (41) formed from a ferritic chromium steel, wherein the ferritic chromium steel is preferably nitrided.

10. Gas injector (1) according to one of the preceding claims, wherein the closing element (3) has a seal carrier (30) and an elastomer (31) arranged on the seal carrier (30), wherein the seal carrier (30) is formed from a martensitic chromium steel, in particular X46Cr13, and / or wherein the elastomer (31) is formed from a soft rubber.

11. Gas injector (1) according to one of the preceding claims, wherein the valve seat (5) is formed from an austenitic chromium-nickel steel, in particular X4CrNi18-12, and / or wherein a surface (51) of the valve seat (5) facing the closing element (3) is mechanically surface-treated by means of fine machining.

12. Gas injector (1) according to one of the preceding claims, further comprising a valve seat housing (11) in which the valve seat (5) is arranged, wherein the valve seat housing (11) is made of a ferritic chromium steel which is titanium-stabilized, in particular X3CrTi17.

13. Gas injector (1) according to one of the preceding claims, further comprising a return spring (10) which is designed to return the closing element (3) to a closed state after the at least one through-opening (50) has been released, wherein a central region (100) of the return spring (10) has a smaller diameter than the end regions (101, 102) of the return spring (10), and / or wherein the return spring (10) is formed from an austenitic chromium-nickel steel, in particular X10CrNi18-8.

14. Gas injector (1) according to one of the preceding claims, further comprising an O-ring (12) which is arranged on an inlet-side end region (8) of the gas injector (1) and is formed from a fluoroelastomer, in particular fluororubber.

15. Gas injector (1) according to one of the preceding claims, further comprising a strainer basket filter (13) for filtering the gaseous hydrogen, which has a strainer (131) made of a stainless steel, preferably of an austenitic chromium-nickel steel, in particular X4CrNi 18-10 or X2CrNi19-11, and / or a frame (132) made of a glass fiber reinforced plastic, and / or a clamping ring (133) made of a stainless steel, preferably of an austenitic chromium-nickel steel, in particular X4CrNi18-12.

16. Device (1000) comprising a gas injector (1) according to one of the preceding claims, wherein the device (1000) is a hydrogen internal combustion engine or a hydrogen fuel cell.

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