Gas injector

Abstract

The invention relates to a gas injector for blowing in gaseous fuel, comprising an electromagnetic actuator having an armature, an inner pole and a coil; the closing element is provided with a valve needle and an armature column, the valve needle releases and closes the gas path at the sealing seat, the armature is connected with the armature column, and the armature column is operatively connected with the valve needle; a lubricant chamber filled with liquid and gas, in which the armature and the armature column are arranged; a reset element that resets the closing element into the closed initial position; a damping device having a damping chamber and a throttle, which is arranged in the lubricant chamber and dampens the closing movement; a compensation chamber as part of the lubricant chamber, the liquid and the gas being disposed in the compensation chamber; and a filling device which fills the damping chamber with a liquid and has a connection path between the compensation chamber and the damping chamber in which a valve assembly is arranged, the minimum cross-section of the connection path being larger than the maximum cross-section of the throttle of the damping device, the valve assembly blocking the connection path in the first direction and releasing the connection path in the second direction.

Description

Technical Field

[0001] The invention relates to a gas injector for injecting a gaseous medium, such as hydrogen, natural gas, methane, LPG, ammonia, etc., into a combustion chamber of an internal combustion engine having improved damping properties by means of a damper with very reliable operating characteristics. Background Art

[0002] Gas injectors are known from the prior art in various configurations. Due to the relatively high gas pressures, especially during the closing process, strong impacts of the closing element, especially the valve needle, on the sealing seat occur. In order not to shorten the service life of the gas injector unnecessarily, a damping device should be provided. In order not to increase the production costs and maintenance unnecessarily, a simple solution is preferred. Summary of the invention

[0003] In contrast, the advantage of the gas injector for blowing gaseous fuel according to the present invention is that a simple and reliable damping of the closing element can be achieved during the closing process of the gas injector. Here, damping is ensured throughout the service life of the gas injector. Damping is also particularly robust and cost-effective, and is therefore suitable for large-scale production of gas injectors. In addition, the damping according to the present invention requires only a very small installation space. During the closing process, the damping can also prevent vibration excitation of other components of the gas injector, thereby significantly reducing the load of other components during operation. Here, according to the present invention, a simple refilling of the damping chamber can be achieved after the damping process. Thus, damping can also be achieved in particular when the switching time is very short, because the damping chamber is always fully filled with liquid. It is also possible to prevent the occurrence of gas in the damping device, and in particular to prevent the formation of evaporation bubbles. In addition, the measures of the present invention can prevent the foaming process in the interior of the lubricant chamber with liquid and gas. A very stable function of the gas injector is thus ensured. In addition, the gas injector can also be arranged not only vertically, that is, the central axis of the gas injector is arranged vertically, but also in an inclined installation position. Here, the inclined installation position can have an angle of ±45°, in particular ±30°, about the vertical axis. The gas injector according to the invention is therefore suitable for internal combustion engines of different manufacturers, in which the installation position can accordingly deviate slightly, in particular slightly from the vertical axis.

[0004] According to the invention, this is achieved in the following manner: the gas injector has an electromagnetic actuator, which has an armature, an inner pole and a coil. In addition, the gas injector includes a closing element with a valve needle, wherein the closing element releases and closes the gas path at the sealing seat at the first end of the gas injector. As a result, the gas is blown into the combustion chamber or the blowing is ended. The closing element also includes an armature column, which is connected to the armature and is operatively connected to the valve needle. The valve needle and the armature column are preferably rod-shaped components, which are loosely attached to each other on the end faces opposite to each other and can move independently of each other. The gas injector also includes a lubricant chamber sealed by a lubricant housing, which is filled with a liquid as a lubricant and a gas. The armature and the armature column are arranged in the lubricant chamber, wherein the lubricant provides lubrication for the components located in the lubricant chamber. The reset element resets the closing element to the closed initial position. The lubricant chamber is preferably provided as a closed space by means of a flexible sealing element, in particular a bellows, wherein the flexible sealing element is arranged on the closing element. Here, the flexible sealing element seals the lubricant chamber relative to the gas to be blown in at the gas path guided through. In addition, the gas injector comprises a damping device for damping the closing process of the closing element, which is arranged in the lubricant chamber. In addition, the gas injector comprises a compensation chamber in which liquid and gas are arranged. In particular, if a temperature-dependent volume change occurs in the component and / or liquid during operation, a lubricant chamber partially filled with gas can achieve a simple volume expansion possibility. The compensation chamber is a partial space of the lubricant chamber. Here, during operation, the gas located in the lubricant chamber is located in the compensation chamber of the gas injector. In addition, the gas injector comprises a filling device for filling the damping chamber of the damping device with liquid from the compensation chamber after the damping process is completed. Here, the damping chamber is filled during the resetting of the gas injector to the closed state and after the resetting is completed. The filling device comprises a connecting path between the compensation chamber and the damping chamber of the damping device. A valve assembly is arranged in the connection path, wherein the minimum cross section of the connection path is greater than the maximum cross section of the throttle of the damping device. This ensures that the damping chamber can be filled quickly and reliably after the end of the blowing. The valve assembly is designed to block the connection path in a first connection direction from the damping chamber to the compensation chamber and to release it in a second connection direction from the compensation chamber to the damping chamber.

[0005] The damping chamber can therefore be filled not only via a narrow cross section of the throttle but also via a filling device according to the invention having a larger cross section than the throttle cross section.

[0006] The compensation chamber is preferably arranged at the end of the gas injector facing away from the sealing seat. If the gas injector is mounted vertically or substantially vertically, the gas in the lubricant chamber therefore accumulates in the compensation chamber in the end of the lubricant chamber facing away.

[0007] Developments of the invention result from preferred embodiments.

[0008] Preferably, the damping piston of the damping device has an additional through-opening, via which the damping chamber can also be filled.

[0009] For a particularly simple structure, the valve assembly preferably comprises a non-return valve, which is arranged in the connecting path. The non-return valve is preferably a simple ball valve preloaded by a spring. The opening direction of the non-return valve is from the compensation chamber to the damping chamber.

[0010] Particularly preferably, the connecting path comprises a first connecting channel and a second connecting channel between the damping chamber and the compensation chamber, the valve assembly being arranged in the first connecting channel and the throttle being arranged in the second connecting channel. Particularly preferably, the first connecting channel and the second connecting channel are constructed in a common housing. This allows a particularly compact structure to be achieved.

[0011] Further preferably, a second check valve is arranged in the second connecting channel. Here, the second check valve blocks the connection path from the compensation chamber to the damping chamber. Therefore, the second connecting channel is only configured as a throttling path between the damping chamber and the compensation chamber. Therefore, the two check valves are installed with different shut-off directions, preferably in a common housing.

[0012] According to a preferred alternative embodiment of the invention, the valve assembly comprises a movable first tongue, which blocks the connection path in the direction from the damping chamber to the compensation chamber and releases it in the direction from the compensation chamber to the damping chamber. The movable tongue can be provided particularly simply and cost-effectively. Preferably, the movable tongue is a sheet metal tongue or a tongue made of plastic material.

[0013] Further preferably, the valve assembly comprises a movable second tongue, which releases the connection path in the direction from the damping chamber to the compensation chamber and blocks it in the direction from the compensation chamber to the damping chamber. Thus, a second connection path is provided between the damping chamber and the compensation chamber, in which a throttle is arranged, which can be released and blocked by means of the second tongue.

[0014] According to another preferred configuration of the present invention, the valve assembly further comprises a movable disk, in which the throttle is constructed and which has a notch for the connection path on its edge. The throttle is preferably a central hole in the disk. The notch on the edge of the disk is preferably a straight section of the periphery of the disk, arranged on the edge.

[0015] According to another preferred configuration of the present invention, the throttle is preferably constructed in the damping piston or the damping housing of the damping device. Here, multiple throttles can also be arranged in the damping piston. These throttles arranged in the damping piston preferably lead to connecting holes, which connect the compensation chamber to the rest of the lubricant chamber.

[0016] According to another preferred embodiment of the present invention, the filling device further comprises a swirl chamber, from which the connecting path from the compensation chamber to the damping chamber begins. This prevents, in particular, the bubbling of the liquid in the compensation chamber. This makes it possible to prevent air bubbles from being able to enter the damping chamber when the damping chamber is filled, which air bubbles could interfere with the function of the damping device.

[0017] The simmer chamber is preferably arranged in a hollow cylinder, which has at least one lateral slot, through which the connection between the simmer chamber and the compensation chamber can be realized.

[0018] The lubricant chamber is sealed by a lubricant housing, which preferably has a plurality of components. Here, the ratio of the liquid, i.e. the liquid lubricant, to the gas in the lubricant chamber is preferably in the range of 70 / 30 volume percent to 95 / 5 volume percent. Particularly preferably, the ratio of the liquid to the gas is in the range of 80 / 20 volume percent to 90 / 10 volume percent. Further preferably, the ratio of the liquid to the gas in the lubricant chamber is about 85 to 15 volume percent. It is thus ensured that damping can be achieved in the lubricant chamber, especially during the closing process, by the liquid located in the lubricant chamber. Thus, although heat may be generated during operation, this heat can be relatively easily released to the gas to be blown in by the gas injector via the lubricant housing. Therefore, the liquid lubricant in the lubricant chamber is prevented from being heated too strongly.

[0019] The damping device preferably comprises a damping piston, a damping housing, a throttle and a damping chamber constructed in the damping housing. The throttle connects the damping chamber to the compensation chamber. A guide area is constructed between the damping piston and the damping housing. As a result, the damping piston is guided in the damping housing. The guidance is preferably carried out over the entire axial length of the damping piston. Here, the guide gap between the damping piston and the damping housing is very small.

[0020] Preferably, the throttle of the damping device is configured such that the throttle length of the throttle in the axial direction of the gas injector is less than or equal to the diameter of the throttle. Thus, by selecting the throttle length and / or the throttle diameter, the throttle characteristic can be adjusted in a simple manner. In particular, the speed at which the liquid flows through the throttle can be adjusted in order to minimize the foaming tendency of the liquid during operation.

[0021] The damping chamber is preferably of pot-shaped design, and the throttle is arranged on the bottom of the pot-shaped damping chamber. This allows a particularly compact and simple structure.

[0022] Further preferably, the gas injector is arranged to be used for blowing gas directly into the combustion chamber of the internal combustion engine.Here, further preferably, the gas injector is a gas injector that opens outwards. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the accompanying drawings:

[0024] Figure 1 A schematic cross-sectional view showing a gas injector with a filling device according to a first preferred embodiment of the present invention,

[0025] Figure 2 Show Figure 1 An enlarged partial cross-sectional view of the damping device and the compensation chamber of the gas injector,

[0026] Figure 3 A partial cross-sectional view showing a gas injector according to a second embodiment of the present invention,

[0027] Figure 4 A partial cross-sectional view showing a gas injector according to a third embodiment of the present invention,

[0028] Figure 5 A partial cross-sectional view showing a gas injector according to a fourth embodiment of the present invention,

[0029] Figures 6 to 8 A partial cross-sectional view showing a gas injector with a filling device according to a fifth embodiment of the present invention, and

[0030] Fig. 9 A partial cross-sectional view showing a gas injector according to a sixth embodiment of the present invention. DETAILED DESCRIPTION

[0031] Below, refer to Figure 1 and Figure 2 A gas injector 1 according to a first preferred embodiment of the present invention will be described in detail.

[0032] Figure 1 The closed state of the gas injector 1 is shown.

[0033] like Figure 1 As shown, a gas injector 1 for injecting gaseous fuel into a combustion chamber 30 comprises an electromagnetic actuator 2. The electromagnetic actuator 2 brings a closing element 3, which in this embodiment is a valve needle that opens outwards, from a closed state into an open state.

[0034] The electromagnetic actuator 2 comprises an armature 20 which bears against the closing element 3 by means of an armature pin 24. Furthermore, the electromagnetic actuator 2 comprises an inner pole 21, a coil 22 and a magnet housing 23 which ensures a magnetic circuit of the electromagnetic actuator.

[0035] The gas injector 1 further comprises a body 7 with an attachment area 70, at which the gaseous fuel is supplied into the inner area of ​​the gas injector. A valve housing 8 is fixed to the body 7, to which a housing sleeve 19 and a valve tube 90 are attached in the axial direction XX of the gas injector. A sealing seat 11 is arranged on the free end of the valve tube 90.

[0036] In this case, the closing element 3 releases and closes the passage for injecting gaseous fuel.

[0037] exist Figure 1 Schematically shown in FIG. 1 are electrical connections 13 which are led through the body 7 to the electromagnetic actuator 2 .

[0038] The closing element 3 is reset from the open position to the closed position by means of the reset element 10. Figure 1 In the closed position shown in Figure 1 In the embodiment, the gas path 14 is schematically indicated by an arrow in the gas injector. Here, the gas path extends substantially around the inner component of the gas injector. Accordingly, here, a through opening is arranged in the component of the gas injector.

[0039] The gas injector 1 further comprises a sealed lubricant chamber 4 which is filled with a liquid 40 as a lubricant, preferably oil, and a gas 41, preferably air. Figure 1 As shown, the lubricant chamber 4 is defined by a bellows 51 fixed to the closing element 3, a sleeve 52, an inner pole 21, a damping housing 60 and a compensation chamber 5. The compensation chamber 5 is arranged at the end of the lubricant chamber 4 facing away from the sealing seat 11.

[0040] The gas injector 1 is shown in a vertical installation position. Here, the axial direction XX is oriented vertically. This ensures that the gas 41 accumulates in the compensation chamber 5. Figure 1 and Figure 2 The boundary 43 between the gas 41 and the liquid 40 is shown in FIG.

[0041] The lubricant chamber 4 is mostly filled with liquid lubricant.

[0042] In particular, lubrication of the armature 20 during operation can thereby be ensured. Furthermore, the restoring element 10 is also arranged in the lubricant chamber.

[0043] The gas injector 1 further comprises a damping device 6 which is arranged in the lubricant chamber 4. The damping device 6 is arranged downstream of the armature 20 in the axial direction, starting from the sealing seat.

[0044] Figure 2 The damping device 6 is shown in detail.

[0045] The damping device 6 comprises a damping piston 61, a damping housing 60, a throttle 62 for the damping process and a damping chamber 63 arranged in the damping housing 60. The damping chamber 63 is fluidically connected to the compensation chamber 5 via the throttle 62, wherein the damping piston 61 is partially arranged in the damping chamber.

[0046] The damping piston 61 is designed in a cylindrical shape and has a through-opening 64 which extends on the central axis of the gas injector.

[0047] The damping device 6 further comprises a reset element 65 for resetting the damping piston 61 to the position in which the damping piston 61 is located. Figure 2 in the initial position shown in .

[0048] like Figure 2 As shown, the end face end 24a of the armature pin 24 facing away from the sealing seat is in direct contact with the end face side 61b of the damping piston 61. The armature pin 24 is guided in a fixed guide component 25. Here, in the closed state of the gas injector, there is a gap 26 between the end face side of the damping piston 61 pointing to the sealing seat and the guide component 25. The reset element 65 is prestressed and supported between the flange 61a of the damping piston 60 and the damping housing 60.

[0049] The gas injector 1 further comprises a filling device 100. The filling device 100 is provided for filling the damping chamber 63 with liquid again after the damping process is completed by the damping device 6. Here, the liquid is supplied from the compensation chamber 5 into the damping chamber 63.

[0050] The filling device 100 comprises a connection path 101 between the compensation chamber 5 and the damping chamber 63. Figure 2 As shown in FIG. 1 , a valve assembly 110 is arranged in the connecting path 101 . Here, the minimum cross section D1 of the connecting path 101 is larger than the maximum cross section D2 of the throttle portion 62 .

[0051] The valve assembly 110 is blocked in the connecting path 101 in a first direction from the damping chamber 63 to the compensation chamber 5 , and is open in a second direction from the compensation chamber 5 to the damping chamber 63 .

[0052] The filling device 100 of the first embodiment includes a valve housing 111 in which a connection path 101 is constructed. A valve seat 112 is provided in the connection path 101 and is arranged at the minimum cross section of the connection path. The valve seat 112 is closed by a ball 113 preloaded by a preload spring 114. Figure 2 The filling device 100 is shown in the closed state.

[0053] A throttle 62 is further arranged in the valve housing 111 . The throttle 62 connects the damping chamber 63 to the compensation chamber 5 via a recess 115 in the valve housing 111 .

[0054] The filling device 100 further comprises a swirl chamber 105 arranged in the compensation chamber 5. The swirl chamber 105 is arranged in a hollow cylinder 106, which is connected to the compensation chamber 5 via at least one slot 107. An inlet 102 leads from the swirl chamber 105 into a connecting path 101. The connecting path 101 leads to an outlet 103 on the damping chamber 63.

[0055] In this case, the swirl chamber 105 is arranged in such a way that the hollow cylinder 106 rests against the cover 50 which seals the compensation chamber 5 .

[0056] Therefore, if Figure 2 As shown in FIG. 1 , half of the flow chamber 105 is filled with gas 41 , and the other half is filled with liquid 40 .

[0057] The compensation chamber 5 is also connected via passages and connecting holes to the rest of the lubricant chamber 4 , in particular to the region in which the armature is arranged.

[0058] Here, the function of the gas injector according to the present invention is as follows. If the gas injector is to be opened, the electromagnetic actuator 2 is energized, and the armature 20 fixedly connected to the armature pin 24 is thereby attracted in the direction of the inner pole 21. Since the armature pin 24 is in direct contact with the closing element 3, the closing element 3 is thereby lifted from the sealing seat 11, so that gas can be blown into the combustion chamber 30.

[0059] In the damping device 6, the damping piston 61 moves toward the guide member 25 by the spring force of the reset element 65, as shown in FIG. Figure 2 In the figure, the gap 26 is eliminated and the volume of the damping chamber 63 is increased. In this case, the lubricant can flow into the damping chamber 63 via the throttle 62 on one side and also via the through-opening 64 on the other side. Figure 2 As indicated by arrow B in FIG. 1 , liquid is supplied from the compensation chamber 5 via the connecting path 101 and the opened valve assembly 110 into the damping chamber 63 by means of the filling device 100 .

[0060] When the gas injector is closed, the electromagnetic actuator 2 is energized so that the reset element 10 resets the closing element 3 and the armature column 24 to the direction of its closed position. Here, the armature column 24 contacts the end face side 61b of the damping piston 61 and moves the damping piston in the direction opposite to the opening direction A.

[0061] Since there is only a very narrow guide gap 6a between the damping piston 61 and the damping housing 60 in the guide area 66, the liquid must be discharged from the damping chamber 63 in order to reset the damping piston 60. Since the guide gap 6a in the guide area 66 is very narrow, this discharge essentially only enters the compensation chamber 5 via the throttle 62. In this case, the valve assembly 110 is closed.

[0062] The liquid from the throttle 62 thus enters the recess 115 at high speed and via the connecting opening into the compensation chamber 5. Here, the liquid accelerated via the throttle 62 is decelerated again, so that in particular the formation of foam or bubbles in the compensation chamber 5 can be prevented. Since the throttle 62 has only a very small cross section, the return movement of the closing element 3 is damped here, because the closing element is in contact with the damping piston 61 via the armature pin 24.

[0063] After the damping process, the damping chamber 63 can now be filled in an unthrottled manner with liquid from the compensation chamber 5 by means of the filling device 100. In this case, the valve assembly 100 is opened by the pressure difference existing between the compensation chamber 5 and the damping chamber 63 during the opening process of the gas injector. In this case, the swirl chamber 105 prevents, in particular, the suction of gas or gas bubbles from the compensation chamber 5.

[0064] Due to the possible high velocity of the liquid in the throttle 62, accumulation of gas or gas bubbles in the liquid may occur in this region. Since the minimum cross section D1 of the connecting path 101 is greater than the maximum cross section of the throttle 62, the filling of the damping chamber 63 is actually only carried out via the filling device 100, so that liquid that may be laden with gas cannot enter the damping chamber 63 via the throttle 62.

[0065] Since the dimensions of the throttle 62 can be manufactured very accurately, in addition to the precise damping of the closing element 3 by the armature column and the damping piston 61, the speed of the liquid flowing out of the throttle can also be adjusted. In particular, the throttling is independent of the axial length of the guide area 66 between the damping piston 61 and the damping housing 60.

[0066] Next, other embodiments of the present invention will be described in detail, wherein the same components are marked with the same reference numerals as those in the first embodiment.

[0067] Figure 3 A gas injector 1 according to a second embodiment of the present invention is shown. Figure 3As can be seen in the figure, the filling device 100 of the second embodiment is constructed differently. The filling device 100 includes a first valve assembly 110 and a second valve assembly 210. The first valve assembly 110 is configured to cut off the connection from the damping chamber 63 to the compensation chamber 5 and to open the connection in the opposite direction as in the first embodiment. The second valve assembly 210 is arranged after the throttle 62 along the flow direction from the damping chamber 63 to the compensation chamber 5. Here, the second ball 213 is sealed on the second valve seat 212 in the valve housing 111. The second ball 213 is preloaded by the second preload spring 214. The first valve assembly 110 is constructed as in the first embodiment. Therefore, this configuration can reliably prevent: during the filling process of the damping chamber 63, liquid may enter the damping chamber 63 via the throttle 62. This makes it possible to exclude that, if bubbles are present in the liquid, especially in the area immediately after the throttle, due to the high flow velocity when flowing through the throttle 62, when the damping chamber 63 is filled, the bubbles flow back into the damping chamber 63 through the open throttle 62. The functional capacity of the damping device 6 in all operating positions is thereby maintained.

[0068] Figure 4 A gas injector according to a third embodiment of the invention is shown. The gas injector of the third embodiment has a first tongue 311 in the connection path 101 between the compensation chamber 5 and the damping chamber 63. The first tongue 311 can be made of a plastic material. The first tongue 311 is arranged to allow flow from the compensation chamber 5 in the direction toward the damping chamber 63 and to block the flow in the opposite direction. Here, Figure 4 The cut-off state of the first tongue 311 is shown.

[0069] Figure 5 A gas injector according to a fourth embodiment of the invention is shown. The fourth embodiment corresponds essentially to the third embodiment, wherein a second tongue 312 is additionally provided in the connection path between the compensation chamber 5 and the damping chamber 63, in which the throttle 62 is arranged. Here, the second tongue 312 closes the flow direction from the compensation chamber 5 in the direction toward the damping chamber 63 and opens the flow direction from the damping chamber 63 to the compensation chamber 5. The second tongue 312 is preferably made of a sheet metal material or the like.

[0070] Figures 6 to 8 A gas injector according to a fifth embodiment of the invention is shown. In the fifth embodiment of the invention, the throttle 62 is arranged in a freely movable disk 400. Here, the throttle 62 is arranged on the central axis of the gas injector. Here, the disk 400 is perpendicular to the central axis of the gas injector and is freely movable in the intermediate space 401. Figure 6 An intermediate position of the disc 400 is shown.

[0071] Figure 7The damping state of the gas injector is shown when liquid flows through the throttle 62 as indicated by arrow D. In this case, the disk bears against the housing part 402 so that liquid can only flow through the throttle 62 .

[0072] Figure 8 Shown with Figure 7 In the opposite situation, Figure 7 The damping chamber 63 is filled in the damping chamber 63. Here, the disk 400 is in contact with the damping housing 61. Figure 8 As shown, the disk 400 has a notch 403 on the lateral radial edge. Figure 8 As shown, liquid can flow from the compensation chamber 5 via the intermediate space 401 and the groove 403 and the further groove 611 in the damping housing 61 into the damping chamber 63. Figure 8 At the same time, the liquid from the compensation chamber 5 can also flow into the damping chamber 63 through the throttle portion 62. Therefore, a filling device with a simple structure having an integrated throttle portion 62 can be provided.

[0073] Fig. 9 A gas injector according to a sixth embodiment of the present invention is shown.

[0074] In the gas injector of the sixth embodiment, the throttle 62 is designed differently from the previous embodiments. In the previous embodiments, the throttle is always arranged on the bottom of the damping chamber 63 in the direction toward the compensation chamber 5. Fig. 9 Three different variations of the arrangement possibilities of the throttle are shown, which can also be used alone or in any combination. For example, a first throttle 621 is provided, which is arranged on the side of the damping piston 61 pointing to the sealing seat. Here, the throttle connects the through-opening 64 in the damping piston 61 to the lubricant chamber 4. For example, a second throttle 622 is shown, which is arranged in the upper third of the damping piston 61. The second throttle 622 also connects the through-opening 64 to the lubricant chamber 4. The third throttle 623 is constructed in the damping housing 61 and connects the damping chamber 63 to the lubricant chamber 4. The filling device 100 is constructed similarly to the first embodiment, however, no throttle or second connecting path is provided between the damping chamber 63 and the compensation chamber 5, but only the first connecting path 101 is provided for filling the damping chamber 63. These three throttles 621, 622 and 623 can also be combined in any combination.

[0075] For all embodiments it should be noted that any combination of the illustrated embodiments would be apparent to a person skilled in the art.

Claims

1. A gas injector for blowing gaseous fuel, the gas injector comprising: An electromagnetic actuator (2), comprising an armature (20), an inner pole (21) and a coil (22); A closing element (3) having a valve needle (31) and an armature pin (24), wherein the valve needle (31) releases and closes a gas path (14) at a sealing seat (11) arranged at a first end of the gas injector, wherein the armature (20) is connected to the armature pin (24), and the armature pin (24) is operatively connected to the valve needle (31); a sealed lubricant chamber (4), the lubricant chamber being filled with a liquid (40) as a lubricant and a gas (41), and the armature (20) and the armature column (24) being arranged in the lubricant chamber, wherein the lubricant provides lubrication in the lubricant chamber (4); A reset element (10), which resets the closing element (3) to a closed initial position; a damping device (6) having a damping chamber (63) and a throttle portion (62), wherein the damping device (6) is arranged in the lubricant chamber (4), wherein the damping device (6) is provided for damping a closing movement of the closing element (3); a compensation chamber (5), which is part of the lubricant chamber (4) and in which a liquid (40) and a gas (41) are arranged; and a filling device (100) arranged to fill the damping chamber (63) with liquid from the compensation chamber (5), The filling device (100) has a connecting path (101) between the compensation chamber (5) and the damping chamber (63), and a valve assembly (110) is arranged in the connecting path. wherein the minimum cross section (D1) of the connecting path (101) is greater than the maximum cross section (D2) of the throttling portion (62) of the damping device (6), The valve assembly (110) blocks the connection path in a first direction from the damping chamber (63) to the compensation chamber (5) and releases it in a second direction from the compensation chamber (5) to the damping chamber (63).

2. The gas injector according to claim 1, wherein: The valve assembly (110) includes a check valve, which is arranged in the connection path (101).

3. The gas injector according to claim 1 or 2, wherein: The connecting path (101) comprises a first connecting channel and a second connecting channel between the damping chamber (63) and the compensation chamber (5), the valve assembly (110) is arranged in the first connecting channel, and the throttling portion (62) is arranged in the second connecting channel.

4. The gas injector according to claim 3, wherein: A second non-return valve is arranged in the second connecting channel, wherein the second non-return valve blocks in the direction from the compensation chamber (5) to the damping chamber (63) and releases in the direction from the damping chamber (63) to the compensation chamber (5).

5. The gas injector according to claim 1, wherein: The valve assembly (110) comprises a movable first tongue (311), which blocks the connection path (101) in the direction from the damping chamber (63) to the compensation chamber (5) and releases it in the direction from the compensation chamber (5) to the damping chamber (63).

6. The gas injector according to claim 5, wherein: The valve assembly comprises a movable second tongue (312), which releases a second connection path having the throttling portion (62) in the direction from the damping chamber (63) to the compensation chamber (5) and blocks it in the direction from the compensation chamber (5) to the damping chamber (63).

7. The gas injector according to claim 1, wherein: The valve assembly (110) comprises a movable disk (400) in which the throttle (62) is formed, wherein a notch (403) is formed on the edge of the disk (400) for the connecting path (101).

8. A gas injector according to any one of the preceding claims, wherein: The throttle portion is arranged in a damping piston (61) or a damping housing (60) of the damping device (6).

9. A gas injector according to any one of the preceding claims, wherein: The filling device (100) has a simmer chamber (105), wherein the first connection path (101) begins at the simmer chamber (105).

10. The gas injector according to claim 9, wherein: The sedation chamber (105) comprises a hollow cylinder (106) having at least one slot (107) and is arranged in the compensation chamber (5).

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