insufflation valve

Abstract

In order to increase the service life of a blow valve having an armature assembly consisting of a magnetic armature, a valve plate and a spring plate, it is provided that in the armature assembly (6) a spring element (34) is arranged axially between the magnetic armature (4) and the spring plate (33) and / or axially between the spring plate (33) and the valve plate (3), which spring element presses the magnetic armature (4) and the spring plate (33) or the spring plate (33) and the valve plate (3) axially away from one another in order to generate an axial pretension (FV).

Description

Technical Field

[0001] This invention relates to a blow-in valve having a housing with a valve seat and a valve plate, the valve plate and the valve seat working together to open and close the blow-in valve. The valve plate is connected to a magnetic armature, and a spring plate is arranged between the valve plate and the magnetic armature. The valve plate, the magnetic armature, and the spring plate constitute an armature assembly. The magnetic armature works with an electromagnet in the blow-in valve to move the armature assembly, thereby lifting the valve plate from the valve seat to open the blow-in valve. A gas volume is provided in the blow-in valve, connected to an inflow opening. The valve seat at least partially limits the gas volume in the blow-in valve and has at least one flow opening that connects the gas volume to an outflow opening when the valve plate is lifted from the valve seat. When the valve plate rests against the valve seat, the valve plate closes the at least one flow opening. Background Technology

[0002] In gas engines using gaseous fuels, such as natural gas (compressed natural gas, CNG) or hydrogen, port fuel injection is frequently employed. Here, gaseous fuel at its existing pressure is injected into the intake manifold or intake passage leading to the internal combustion engine cylinders via the port fuel valve. The port fuel valve is supplied with fuel at a predetermined pressure by the fuel rail. The advantage of port fuel injection compared to direct injection into the cylinders is the lower injection pressure of the gaseous fuel, typically 0 to 30 bar relative to ambient pressure, allowing for a simpler design of the fuel supply system components. The amount of fuel injected, particularly gaseous fuel, is controlled by a control device, specifically by the opening time of the port fuel valve. This allows for precise metering. The primary requirement for the port fuel valve is a high flow rate to achieve the desired gas volume within a short possible opening time. Due to the very high switching frequency and number of switching operations, the wear resistance of the port fuel valve is also important to ensure a sufficiently long service life. This presents a significant challenge, especially with oil-free gaseous fuels such as hydrogen, as the valve components are not lubricated. Equally important is that the blow-in valve should leak as little as possible to at least largely prevent gaseous fuel from escaping when the blow-in valve is closed.

[0003] Such a blow-in valve is known in the prior art. WO 2022 / 180593 A1 shows an electromagnetically operated blow-in valve. A valve plate, which interacts with a valve seat, is arranged on a magnetic armature. If the electromagnet is activated, the magnetic armature, along with the valve plate, is attracted, and the valve plate is lifted off the valve seat. If the magnetic armature is deactivated, the magnetic armature, along with the valve plate, is pressed against the valve seat by a helical spring, and the blow-in valve is closed. The magnetic armature and the valve plate are guided within the blow-in valve by a spring plate. The spring plate is held within the housing of the blow-in valve by its radially outer edge region. The magnetic armature, the valve plate, and the spring plate are fixedly connected to each other and constitute an armature assembly. For this purpose, the magnetic armature and the spring plate are first connected to each other in the central region by means of a rivet. Then, a valve plate made of plastic is injection molded onto the side of the spring plate. The manufacture of the armature assembly is therefore very complex. US2019 / 0368457 A1 also shows a blow-in valve with an armature assembly consisting of a magnetic armature rigidly connected to each other, a valve plate, and a spring plate located between the two.

[0004] There are also blow-in valves in which the valve plate and the magnetic armature are screwed together by screws. An example of this can be found in WO 2015 / 144341 A1.

[0005] The moving and stationary components of the blow-in valve are subjected to high loads, with the stationary component contacting the moving component during operation. This is due, in part, to the very high speed of the moving component, generated by the required short opening and closing times. This high speed also results in high impact loads from the moving component (e.g., valve plate or magnetic armature) striking the stationary component (e.g., valve seat or armature stop). Furthermore, due to the application, the blow-in valve is operated a large number of times per second. Depending on the engine speed, the blow-in valve can be operated on the order of approximately once per second to approximately ten times per second, typically with switching frequencies in the range of 1 Hz to 25 Hz. However, the required service life of such a blow-in valve is even more challenging. Here, the blow-in valve is typically required to withstand hundreds of millions of load cycles. These high and very frequent loads act particularly on the armature assembly, which is fixedly interconnected and consists of a magnetic armature, a valve plate, and, if necessary, a spring plate. These loads can cause the individual components of the armature assembly to loosen and begin to move relative to each other. This relative motion significantly increases wear in the blow-in valve, particularly in the armature assembly, and can lead to rapid and premature failure of the blow-in valve. Summary of the Invention

[0006] The purpose of this invention is to provide a blow-in valve having an armature assembly consisting of a magnetic armature, a valve plate, and a spring plate, which has an improved service life.

[0007] This objective is achieved by axially arranging a spring element in the armature assembly between the magnetic armature and the spring plate and / or axially between the spring plate and the valve plate. This spring element axially presses the magnetic armature and the spring plate, or the spring plate and the valve plate, apart to generate an axial preload. The preload force acting through the spring element prevents the components of the armature assembly from loosening due to the applied load and prevents relative movement between these components, which would otherwise significantly increase wear in the armature assembly and shorten the service life of the blow-in valve.

[0008] By axially placing a gasket between the magnetic armature and the spring element and / or axially between the valve plate and the spring element in the armature assembly, the localized loads generated by the spring element and acting on the valve plate and / or the magnetic armature can be better absorbed and distributed. This also helps to reduce wear on the blow-in valve and increase its service life.

[0009] The connection between the magnetic plate and the valve plate is advantageously achieved through a press fit between a journal on the magnetic plate or valve plate and a recess on the valve plate and / or the magnetic plate. The journal can also be designed as a separate component, or as a journal with a shoulder at one axial end. Threads can also be used instead of a press fit.

[0010] The spring plate is advantageously secured in the blow-in valve by clamping its radially outer edge into the housing. This achieves a defined position of the spring plate. The radially outer edge of the spring plate can be at least partially material-locked to the housing. By clamping the radially outer edge of the spring plate into the housing (with additional material locking if necessary), the radially outer edge of the spring plate will not loosen due to settlement that may occur under operating loads. This also contributes to extending the service life of the blow-in valve. Attached Figure Description

[0011] The following reference Figures 1 to 3 The invention will be explained in more detail here, and the accompanying drawings illustrate advantageous embodiments of the invention in an exemplary, schematic, and non-limiting manner. In the drawings:

[0012] Figure 1 The blow-in valve according to the invention is shown;

[0013] Figure 2 An armature assembly according to the invention is shown; and

[0014] Figure 3 An exploded view of the armature assembly according to the present invention is shown. Detailed Implementation

[0015] According to the present invention Figure 1The blow-in valve 1 shown has a valve seat 2 and a valve plate 3, which work together with the valve seat 2 to open and close the blow-in valve 1. The valve plate 3 can reciprocate between a closed position and an open position within the blow-in valve 1, in which the valve plate 3 rests against the valve seat 2 in the axial direction (e.g., in the closed position). Figure 1 As shown), in the open position, valve plate 3 is lifted axially from valve seat 2. The axial direction corresponds to the direction of movement of valve plate 3. To move valve plate 3, it is connected to magnetic armature 4. A spring plate 33 is arranged between valve plate 3 and magnetic armature 4. Valve plate 3, magnetic armature 4, and spring plate 33 constitute armature assembly 6. Valve plate 3 and magnetic armature 4 move together with armature assembly 6. During the operation of blow-in valve 1, magnetic armature 4 works in conjunction with electromagnet 5 in blow-in valve 1 to move armature assembly 6 by energizing electromagnet 5. The electrical connector required to operate electromagnet 5 is located at... Figure 1 It is not shown in the figure and is not important to the present invention.

[0016] A gas volume 7 is also provided in the blow-in valve 1, which is connected to the inflow opening 8 of the blow-in valve 1. During operation of the blow-in valve 1, a gaseous medium is delivered into the gas volume 7 through the inflow opening 8. The gas volume 7 is at least partially limited by the valve seat 2. Figure 1 In the illustrated embodiment, the gas volume 7 is confined in the axial direction. The gas volume 7 in the blow-in valve 1 is further confined by the housing 11 and electromagnet 5 of the blow-in valve 1 and / or by other components of the blow-in valve 1. At least one flow opening 10 is provided in the valve seat 2, which connects the gas volume 7 to the outflow opening 9 of the blow-in valve 1 when the valve plate 3 is lifted from the valve seat 2. When the valve plate 3 rests against the valve seat 2, it closes the at least one flow opening 10. When the blow-in valve 1 is open, i.e., when the valve plate 3 is lifted from the valve seat 2, a flow path is created from the inflow opening 8 through the gas volume 7 and the at least one flow opening 10 to the outflow opening 9. This flow path is interrupted when the blow-in valve 1 is closed.

[0017] The various parts and components of the blow-in valve 1 are arranged in the housing 11. For manufacturing and assembly reasons, the housing 11 is preferably configured as a multi-part structure.

[0018] By controlling the opening time of the blow-in valve 1 and the predetermined known gas pressure of the gaseous medium, the amount of gaseous medium discharged through the outflow opening 9 can be precisely controlled.

[0019] The spring plate 33 is advantageously clamped in the housing 11 of the blow-in valve 1 by its radially outer region. For this purpose, the housing 11 is advantageously configured as at least two parts. The radially outer region of the spring plate 33 can also be locked to the material of the housing 11, for example, by bonding or welding. The spring plate 33 thus carries and holds the armature assembly 6 in the blow-in valve 1. The spring plate 33 centers the armature assembly 6, particularly the valve plate 3, and allows the armature assembly 6 to move axially back and forth in the blow-in valve 1. Simultaneously, when the blow-in valve 1 is closed, the spring plate 33 generates a spring force that presses the valve plate 3 against the valve seat 2. The spring plate 9 can be composed of a radially outer ring and a radially inner ring, which are interconnected by multiple spring arms (e.g., ...). Figure 3 (As shown).

[0020] However, an additional spring can be placed between electromagnet 5 and magnetic armature 4 to increase the spring force used to keep the blow-in valve 2 closed. This additional spring can also primarily apply the spring force used to keep the blow-in valve 1 closed.

[0021] For the purposes of this invention, it is not important how the valve plate 3, the magnetic armature 4, and the spring plate 33 are connected to each other to form the armature assembly 6. For example, the valve plate 3 and the magnetic armature 4 can be screwed together, wherein the spring plate 33 is axially clamped and held between the two components during screwing. However, it is also conceivable to connect the valve plate 3 and the magnetic armature 4, as well as the spring plate 33 axially arranged between them, to each other by means of a press fit (interference fit).

[0022] To prevent the components of the armature assembly 6 from loosening and starting to move relative to each other during the operation of the blow-in valve 1, axially between the magnetic armature 4 and the spring plate 33 (e.g. Figure 1 (as shown) or axially between valve plate 3 and spring plate 33 (as shown) Figure 2 (As shown) or at these two locations, a spring element 34 is arranged, which axially presses the magnetic armature 4 and the spring plate 33 or the valve plate 3 and the spring plate 33 apart, so as to generate an axial preload F in the armature assembly 6. V This preload prevents the components of the armature assembly 6 from loosening. Since the available structural space for the armature assembly 6 in the blow-in valve 1 is very small, the spring element 34 is advantageously configured as a disc spring, which requires very little axial space and has a customizable diameter. The spring element 34 can also be composed of multiple disc springs, for example, as a disc spring assembly, or implemented using other springs.

[0023] exist Figure 1In one embodiment of the armature assembly 6, the valve plate 3 and the spring plate 33 are fitted onto the journal 35 of the magnetic armature 4, wherein the spring plate 33 is arranged between the magnetic armature 4 and the valve plate 3. In the illustrated embodiment, the journal 35 and the valve plate 3 are held together by a press fit. For this purpose, the valve plate 3 and the spring plate 33 have a central recess 36 through which the journal 35 axially passes. The journal 35 may also be designed as a threaded journal with external threads, and the recess on the valve plate 3 may be designed as a hole with internal threads that screw onto the external threads. However, the journal 35 (with external threads if necessary) may also be arranged on the valve plate 3, while the recess 36 (with internal threads if necessary) is arranged on the magnetic armature 4.

[0024] Figure 2 The armature assembly 6 according to the invention is shown in an enlarged manner and in another embodiment. Figure 3 The armature assembly 6 is shown in an exploded view. In this embodiment, the journal 35 is designed as a separate component and is not part of the magnetic armature 4 or the valve plate 3. In this embodiment, a central recess 36 is provided on the valve plate, and another central recess 37 is provided on the magnetic armature 4. The spring element 34 and the spring plate 9, as well as the spacer 38 if necessary, also have corresponding central recesses. The journal 35 is inserted through the recess 36 on the valve plate 3, through the central recesses of the spring element 34 and the spring plate, and, if necessary, the spacer 38, and into the recess 37 on the magnetic armature 4. The journal 35 forms a press fit with the magnetic armature 4, and the valve plate 3 is held at a shoulder 39 on one axial end of the journal 35. The journal 35 can also be inserted in the opposite direction, with the shoulder 39 abutting against the magnetic armature 4, thereby forming a press fit between the journal 35 and the valve plate 3. The journal 35 can also be implemented without the shoulder 39. In this case, a press fit is provided between the journal 35 and the magnetic armature 4, and between the journal 35 and the valve plate 3. The spring plate 33 is here axially arranged between the valve plate 3 and the magnetic armature 4.

[0025] Instead of a press fit, threads can be provided between the journal 35 and the magnetic armature 4 and / or between the journal 35 and the valve plate 3. For this purpose, corresponding external threads can be provided on the journal 35 and internal threads on the magnetic armature 4 and / or the valve plate 3. For a journal 35 with a shoulder 39, the external thread is provided on the axial end of the journal 35 opposite to the shoulder 39.

[0026] For the journal 35, which is a separate component, one axial end can be implemented as an external thread, while the other axial end is used for a press fit. In each embodiment, the journal 35 passes through a central recess on the spring plate 33.

[0027] exist Figure 2 and Figure 3In this embodiment, the spring element 35 (here, a disc spring) is axially arranged between the spring plate 33 and the valve plate 3. Furthermore, in this embodiment, a spacer 38 is axially arranged between the spring element 35 and the valve plate 3, such that the spring element 35 axially abuts against the spacer 38, and the spacer 38 axially abuts against the valve plate 3. This spacer 38 may be advantageous if the valve plate 3 is made of plastic and the spring force of the spring element 35 may damage (at least over time) the plastic valve plate 3. The spacer 38 may also be alternatively or additionally provided between the spring element 35 and the magnetic armature 4, or between the spring plate 33 and the magnetic armature 4.

[0028] In another advantageous embodiment, an additional spring element, such as a disc spring, may be arranged between the housing 11 and the radially outer edge of the spring plate 33 (through which the spring plate 33 is clamped in the housing). This spring element can also be used to prevent possible loosening of the spring plate 33 at the clamping point on the housing 11 by means of a preload. A clamping ring may also be arranged between the spring element and the housing.

[0029] exist Figure 1 As shown, the valve seat 2 is advantageously inserted into the housing 11 and axially abuts against the protrusion 40 of the housing 11 in the axial direction. The protrusion 40 may also be implemented as a ring inserted into the housing 11. The valve seat 2 can be pressed against and held against the protrusion 40 by the pressure difference between the pressure of the conveyed gaseous medium and the pressure acting at the outlet opening 9.

[0030] Another advantageous, optional feature of the blow-in valve 1 according to the invention is an opening stop 42, on which the magnetic armature 4 strikes at the end of the opening movement. The opening stop 42 thereby restricts the opening movement of the armature assembly 6 when the blow-in valve 1 is opened. Figure 1 In this embodiment, an opening stop 42 is provided. In this embodiment, the opening stop 42 is radially arranged between the housing 11 and the electromagnet 5. However, the opening stop 42 can of course be arranged in other locations. To minimize wear, an advantageous material combination of the magnetic armature 4 and the opening stop 42 can also be provided. The magnetic armature 4 will be made of metal, and for this purpose, a suitable impact-resistant plastic is suitable for the opening stop 42. It can also be specified that the magnetic armature 4 undergoes surface treatment in the area of ​​the opening stop 42 to improve the fatigue strength of the magnetic armature 4 against the high number of impacts that occur when the blow-in valve 1 is opened. The surface treatment can be implemented as nitriding for forming a nitride layer or as a hard material coating.

Claims

1. A blow-in valve having a housing (11) and a valve seat (2) and a valve plate (3) acting in conjunction with the valve seat (2) to open and close the blow-in valve (1), wherein, A valve plate (3) is connected to a magnetic armature (4), and a spring plate (33) is arranged between the valve plate (3) and the magnetic armature (4). The valve plate (3), the magnetic armature (4), and the spring plate (33) constitute an armature assembly (6). The magnetic armature (4) works together with the electromagnet (5) in the blow-in valve (1) to move the armature assembly (6), thereby lifting the valve plate (3) from the valve seat (2) to open the blow-in valve (1). A gas volume (7) is provided in the blow-in valve (1), which is connected to the inflow opening (8) of the blow-in valve (1). The valve seat (2) at least partially limits the gas volume (7) in the blow-in valve (1). The valve plate (3) is provided with at least one flow opening (10) that connects the gas volume (7) to the outflow opening (9) of the blow-in valve (1) when the valve plate (3) is lifted from the valve seat (2), and closes the at least one flow opening (10) when the valve plate (3) is against the valve seat (2). The valve plate (3) is characterized by having a spring element (34) axially arranged between the magnetic armature (4) and the spring plate (33) and / or axially between the spring plate (33) and the valve plate (3) in the armature assembly (6). This spring element axially presses the magnetic armature (4) and the spring plate (33) or the spring plate (33) and the valve plate (3) apart to generate an axial preload (F). V ).

2. The blow-in valve according to claim 1, characterized in that, In the armature assembly (6), spacer pads (38) are arranged axially between the magnetic armature (4) and the spring element (34) and / or axially between the valve plate (3) and the spring element (34).

3. The blow-in valve according to claim 1 or 2, characterized in that, A journal (35) is provided on the magnetic armature (4), which is arranged in the recess (36) of the valve plate (3) for forming a press fit, or a journal (35) is provided on the valve plate (3), which is arranged in the recess (37) of the magnetic armature (4) for forming a press fit.

4. The blow-in valve according to claim 1 or 2, characterized in that, A journal (35) with external threads is provided on the magnetic armature (4), which is screwed into a recess (36) with internal threads on the valve plate (3), or a journal (35) with external threads is provided on the valve plate (3), which is screwed into a recess (37) with internal threads on the magnetic armature (4).

5. The blow-in valve according to claim 1 or 2, characterized in that, It is provided with a separate journal (35) which is arranged in a recess (36) on the valve plate (3) for forming a press fit and in a recess (37) in the magnetic armature (4) for forming a press fit.

6. The blow-in valve according to claim 1 or 2, characterized in that, A separate journal (35) is provided, which is arranged in a recess (36) with internal threads on the valve plate (3) by means of a first external thread, and the journal is arranged in a recess (37) with internal threads in the magnetic armature (4) by means of a second external thread.

7. The blow-in valve according to claim 1 or 2, characterized in that, A separate journal (35) is provided, which has a shoulder (39) at one axial end of the journal (35), which is arranged in a recess (36) on the valve plate (3) for forming a press fit, wherein the shoulder (39) rests against the magnetic armature (4) or is arranged in a recess (37) on the magnetic armature (4) for forming a press fit, wherein the shoulder (39) rests against the valve plate (3).

8. The blow-in valve according to claim 1 or 2, characterized in that, A separate journal (35) is provided, which has a shoulder (39) at one axial end and external threads at the opposite axial end of the journal (35), wherein the journal (35) is screwed into a threaded recess (36) on the valve plate (3) and the shoulder (39) rests against the magnetic armature (4), or the journal (35) is screwed into a threaded recess (37) on the magnetic armature (4) and the shoulder (39) rests against the valve plate (3).

9. The blow-in valve according to any one of claims 1 to 8, characterized in that, The radial outer edge of the spring plate (33) is clamped in the housing (11).

10. The blow-in valve according to claim 9, characterized in that, The radial outer edge of the spring plate (33) is at least partially material-locked to the housing (11).

11. The blow-in valve according to any one of claims 1 to 10, characterized in that, An opening stop (42) is provided in the housing (11), and the magnetic armature (4) abuts against the opening stop when the blow-in valve (1) is opened, and the magnetic armature (4) is surface treated in the area of ​​the opening stop (42).

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