WO2018024507A1

WO2018024507A1 - Gas valve having increased magnetic force

Info

Publication number: WO2018024507A1
Application number: PCT/EP2017/068456
Authority: WO
Inventors: Jochen Wessner
Original assignee: Robert Bosch Gmbh
Priority date: 2016-08-02
Filing date: 2017-07-21
Publication date: 2018-02-08
Also published as: DE102016214192A1

Abstract

The invention relates to a gas valve for supplying a gaseous medium, comprising a closing element (2) for exposing and closing at least one outlet opening (3), an armature (4) connected to the closing element (2), a magnetic core (5), a magnetic coil (6), and a magnetic return element (7), wherein the armature (4) has an armature end face (40) directed in the direction of the center axis (X-X), which is completely covered by the magnetic core (5) in the direction of the center axis (X-X).

Description

Description title

Gas valve with increased magnetic force State of the art

The present invention relates to a gas valve for injecting a gaseous fuel, in particular hydrogen, with an increased magnetic force to facilitate an opening operation and a design. Furthermore, the present invention relates to a fuel cell assembly with a gas valve with increased opening force.

Gas valves are different from the prior art

Embodiments known. In particular, in the automotive sector in addition to liquid fuels gaseous fuels such. As natural gas or hydrogen used. In the design of such gas valves, however, are different for gaseous media

To comply with requirement profiles. Since usually the gaseous media are under high pressure, in particular larger opening forces must be provided. Due to the tight space conditions in the

Internal combustion engines is a further requirement in this case, however, that the installation space of such gas valves is as small as possible.

Disclosure of the invention

The gas valve according to the invention for supplying a gaseous medium with the features of claim 1 has the advantage that with the same size an increased magnetic force and thus an increased opening force to open a closing element is possible. The

Closing element is provided for releasing and closing at least one passage opening. This also allows a much improved system design of the gas valve with respect to the gaseous medium be achieved. This is inventively achieved in that the

Closing element is connected to an anchor. The gas valve further includes a magnetic core, a solenoid, and a magnetic core

Return element. Thus, the gas valve is an electromagnetic

controllable gas valve. Here is a directed to the magnetic core

Anchor end face provided in the direction of the central axis of the armature, which is completely covered in the direction of the central axis of the magnetic core. In other words, in a plan view from above on the gas valve, the armature end face is completely covered by the magnetic core. By this measure can

According to the invention an enlargement of the pole face of the magnetic core can be achieved, whereby stronger magnetic forces are obtained.

The dependent claims show preferred developments of the invention. Preferably, the anchor end face is tapered, in particular conically tapering, to the central axis. In this way, a particularly cost-effective manufacturability of the anchor can be ensured.

More preferably, a geometric shape of the anchor is directed

Magnetic core end face complementary to a geometric shape of the

Armature end face. Ie. For example, if the armature end face is conical, and the magnetic core end face, which is directed to the armature, is conically formed with the same pitch. To provide an even greater magnetic force, has the

Magnetic core preferably in addition to the Axialüberdeckung in the direction of the central axis and a radial overlap perpendicular to the central axis of a portion of the armature. This is particularly preferably realized in that the magnetic core has a cylinder extension extending in the direction of the central axis. The cylinder extension is thus formed annular and encloses radially a portion of the armature.

According to a further preferred embodiment of the present invention, a plane is provided in the closed state of the gas valve, which is perpendicular to the central axis of the gas valve and which by an edge at a transition from the armature end face of the armature to a

Ankermantelfläche runs and wherein in the plane an end face of Magnetic core is located. Particularly preferably, the end face of the magnetic core lying in the direction of the central axis is an exposed end of the

Cylinder extension of the magnetic core.

A further increase in the magnetic force is possible if, preferably, the armature has a larger diameter at the end region remote from the passage opening than at all other remaining regions of the armature. Thus, the widest point of the anchor to that of the

Passage opening facing away from the end portion provided in the direction of the magnetic core.

More preferably, the closing element comprises an elongated

Needle area, wherein in the direction of the central axis of the gas valve between a first bearing for supporting the closing element and the armature, a portion of the magnetic core is arranged. The anchor is fixed to the needle area. The portion of the magnetic core extends to the needle area of the

Closing element to achieve a highest coverage between the magnetic core and the armature when projecting in the direction of the central axis. The needle portion is passed through the magnetic core with a minimum radial gap between the needle portion and the magnetic core to maintain the mobility of the needle portion.

More preferably, an air gap between the armature and the magnetic core by a first conical surface on the armature and a second conical surface on

Magnetic core defined. Thus, the air gap has a conical shape.

For a particularly compact construction, a separating sleeve for separating the magnetic flux from the cylinder extension of the magnetic core is moreover preferably arranged.

Furthermore, the present invention relates to a fuel cell assembly comprising a gas valve according to the invention. The gas valve is particularly preferably configured to supply hydrogen.

Short description of the drawing Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:

1 shows a schematic sectional view of a gas valve according to a first preferred embodiment of the invention,

Figure 2 is an enlarged partial sectional view of the gas valve of Figure 1 and

Figure 3 is an enlarged partial sectional view of a gas valve according to a second embodiment of the invention.

Preferred embodiment of the invention

Hereinafter, a gas valve 1 according to a first preferred embodiment of the invention will be described in detail with reference to Figures 1 and 2.

The gas valve 1 is designed to supply a gaseous medium, in particular hydrogen, to a fuel cell.

The gas valve 1 is actuated electromagnetically and has a

electromagnetic actuator, which operates a closing element 2 to release passage openings 3 on a valve seat 22 and close. FIG. 1 shows the closed state of the gas valve.

The electromagnetic actuator comprises an armature 4, a magnetic core 5, a magnetic return element 7 and a magnetic coil 6. Further, a separating sleeve 8 is provided to provide a magnetic separation between the armature 4 and the return element 7. The return element 7 is composed of several parts to ensure easy assembly.

The closing element 2 comprises an elongated valve needle 20, at its end region directed towards the passage openings 3, a valve closing body 21 is arranged. The valve closing body 21 seals on the valve seat 22. The gaseous medium is passed through the gas valve 1 itself.

Between the armature 4 and the magnetic core 5, an air gap 9 is provided.

As can be seen from Figure 1, the armature 4 at one of the

Through openings 3 facing away from an anchor end face 40, which is provided conically. Furthermore, the region of the armature facing away from the passage openings 3 has a first diameter D1, which is greater than a remaining second diameter D2 of the armature 4. In this way, an area of the armature 4 can be increased at the magnet core-side end of the armature.

The magnetic core 5 has a magnetic core end face 50, which is also conical. In this case, the magnetic core end face 50 is designed to be complementary to the armature end face 40, so that the two faces extend parallel to one another. This results in an air gap 9 between the magnetic core 5 and the armature 4, which has a conical shape, which are bounded by the armature end face 40 and the magnetic core end face 50.

As can be seen in particular from FIG. 2, the magnetic core 5 comprises a cylindrical extension 51 at a radially outer region. The cylinder extension 51 is provided in one piece on the magnetic core 5. On a radial outer side of the cylinder extension 51, the separating sleeve 8 is arranged. The separating sleeve 8 can be pushed onto the cylinder extension 51 by means of a slight press fit and fixed to the magnetic core 5, for example, by means of a weld.

By the cylinder extension 51 on the magnetic core 5, an optimization of a force curve can be made possible immediately before a tightening process of the armature 4.

An end surface 53 of the cylinder extension 51 is in the closed state of the gas valve in a plane E1, which is aligned perpendicular to the center axis XX of the gas valve 1. Furthermore, there is also an edge 41, which at the transition between the anchor end face 40 and an armature jacket surface 42nd is provided in the plane E1. Thus, the edge 41 and the free end of the cylinder extension 51 lie together in the plane E1.

The closing element 2 is mounted on a first bearing 1 1 and a second bearing 12. The magnetic core 5 has a partial region 52 which is arranged in the direction of the central axis X-X between the first bearing 11 and the armature 4. The second bearing 12 is on the magnetic yoke element. 7

intended. The first bearing 1 1 and the second bearing 12 each store the valve needle 20th

A return element 10 is connected to the closing element 2 and serves to close the gas valve or to hold the gas valve in the closed position shown in Figure 1.

Between the portion 52 of the magnetic core 5 and the valve needle 20, a minimum gap is provided to ensure a movement capability of the valve needle 20.

As can be seen from FIG. 1, the armature 4 is thus formed on the end facing the magnetic core 5 such that a projection in the direction of the central axis X-X of the magnetic core 5 completely covers the armature 4. This ensures that very high magnetic forces are present, which can be used to open the closing element 2. An external dimension of the gas valve does not have to be increased. Thus, according to the invention, a gas valve 1 can be provided, which in comparison with the prior art with the same outer dimensions a larger

Can provide magnetic force. This results in a greater latitude in an optimal design of the gas valve for each gaseous medium to be controlled.

FIG. 3 shows a gas valve 1 according to a second exemplary embodiment of the invention. The gas valve 1 of the second embodiment is in

Substantially the same as that of the first embodiment. In contrast to the first embodiment is the second

Embodiment of the cylinder extension 51 formed differently. As shown in FIG. 3, an end face 53 of the cylinder extension 51, which lies in the plane E1, is provided such that in the closed state of the cylinder Gas valve, the edge 41 at anchor 4 between the armature end face 40 and the armor jacket surface 42 is no longer in the plane E1. This is achieved in that the cylinder extension 51 of the magnetic core 5 is formed longer in the direction of the center axis XX in the second embodiment than in the first embodiment. A length of the cylinder extension 51 is selected such that in the closed state of the gas valve 1, which is shown in Fig. 3, the plane E1 is up to half of a height H1 of the armature 4 at the anchor portion with the first larger diameter D1. In this

In the embodiment, the plane E1, in which the end surface 53 of the cylinder extension 51 is located, is exactly half the height H 1. It should be noted, however, that the cylinder extension 51 can also be formed so that the plane E1 is closer to the edge 41 of the Anchor 4 is, for example, at one-third of the height H1 or a quarter of the height H1. Otherwise, this embodiment corresponds to the first embodiment, so that reference can be made to the description given there.

Claims

claims

1 . A gas valve for supplying a gaseous medium, comprising:

a closing element (2) for releasing and closing at least one passage opening (3),

- An anchor (4) connected to the closing element (2),

a magnetic core (5),

- A magnetic coil (6), and

a magnetic return element (7),

- wherein the armature (4) to the magnetic core (5) in the direction of

Central axis (X-X) directed anchor end face (40) which is completely covered in the direction of the central axis (X-X) of the magnetic core (5).

2. Gas valve according to claim 1, wherein the anchor end face (40) itself

is formed tapering, in particular is conically tapered.

3. Gas valve according to one of the preceding claims, wherein the

geometric shape of an armature (4) directed magnetic core end face (50) complementary to the geometric shape of

Anchor end face (40).

4. Gas valve according to one of the preceding claims, wherein the

Magnetic core (5) in addition to an axial overlap in the direction of the central axis (X-X) also has a radial overlap of the armature (4).

5. Gas valve according to one of the preceding claims, wherein the

Magnetic core (5) in the direction of the central axis (X-X) extending cylinder extension (51).

6. Gas valve according to claim 5, wherein in the closed state of

Gas valve, a plane (E1) which is perpendicular to the central axis (XX), by an edge (41) at a transition between the anchor end face (40) and an armature jacket surface (42) and wherein in the plane (E1) an end face (53) of the magnetic core, in particular the cylindrical extension (51), is located.

Gas valve according to one of the preceding claims, wherein the armature (4) at an end region remote from the passage opening (3) has a first diameter D1, which is greater than a second diameter (D2) at remaining areas of the armature.

Gas valve according to one of the preceding claims, wherein the

Closing element (2) has an elongated needle portion (20) on which the armature (4) is fixed, wherein in the direction of the central axis (XX) between a first bearing (1 1) for supporting the closing element (2) and the armature (4 ) A portion (52) of the magnetic core is arranged.

Gas valve according to one of the preceding claims, wherein an air gap (9) between the armature (4) and the magnetic core (5) by a

cone-shaped anchor end face (40) and a conical magnetic core end face (50) is defined.

Gas valve according to one of claims 5 to 9, wherein a separating sleeve (8) for the separation of a magnetic flux at the cylinder extension (51) of the magnetic core (5) is fixed.

Fuel cell assembly comprising a gas valve (1) according to one of the preceding claims.