CN110741190A

CN110741190A - Valve device

Info

Publication number: CN110741190A
Application number: CN201880039567.6A
Authority: CN
Inventors: M·库尔茨
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2017-06-13
Filing date: 2018-05-28
Publication date: 2020-01-31
Also published as: DE102017209959A1; WO2018228805A1

Abstract

The invention relates to valve devices having at least closing units (12 a; 12 b; 12c) which, in at least valve positions, are provided for fluid-tight closing of at least fluid channels (14 a; 14 b; 14c) and which comprise at least sealing elements (16 a; 16 b; 16c) which are provided for sealing contact against sealing seats (18 a; 18 b; 18c), and having an armature unit (20 a; 20 b; 20c) which has at least armature elements (22 a; 22 b; 22c) and which is provided for moving the sealing elements (16 a; 16 b; 16c) in directions of movement, and having a compensation unit (24 a; 24 b; 24c) which is provided for compensating at least deformations of the at least sealing elements (16 a; 16 b; 16 c).

Description

Valve device

Background

valve arrangements having at least closing units which, in at least valve positions, are provided for fluid-tight closing of at least fluid passages and which comprise at least sealing elements which are provided for sealing abutment against a valve seat, and having an armature unit which has at least armature elements and which is provided for moving the sealing elements in directions of movement have been proposed.

Disclosure of Invention

The invention proceeds from valve arrangements having at least closing units which, in at least valve positions, are provided for fluid-tight closing of at least fluid passages and which comprise at least sealing elements which are provided for sealing abutment against a valve seat, and having an armature unit which has at least armature elements and which is provided for moving the sealing elements in directions of movement.

It is proposed that the valve device has a compensation unit which is provided for compensating at least deformations of at least sealing elements.

The term "valve device" is to be understood in the context of a valve, in particular a fuel valve, and advantageously a fuel metering valve, in particular at least part, in particular a sub-assembly, of a valve, in particular a fuel valve, and advantageously a fuel metering valve, in the present case, the valve device is preferably configured as a gas valve and particularly preferably as a hydrogen-metering valve, and is particularly configured for use in a fuel cell system, and is preferably configured for metering at least fluid and/or for preventing a fluid flow from at least 3 inflow channels to at least outflow channels, in this case, the valve device may include, in particular, at least valve housings, a reset unit and/or a magnet unit, which is advantageously configured as an outer housing, the reset unit being particularly configured for resetting the fluid closing unit to a valve position, in particular a closed position, and/or closed position, in particular to a closed position, preferably open position, and/or closed position, in particular to form a closed position, preferably open fluid flow through a fluid channel unit, preferably a fluid chamber or fluid chamber unit, preferably a fluid chamber, and/or fluid chamber unit, and/or a fluid chamber unit, preferably a fluid chamber, preferably a closed position sealing unit, and/or a fluid chamber, preferably a chamber, and/or a chamber, preferably a chamber, and/preferably a chamber, and/or a chamber, preferably a chamber, and/preferably a chamber, and/preferably a chamber, preferably a chamber, preferably a chamber.

In addition, an "armature unit" is to be understood to mean, in particular, a unit which is operatively connected to the closing unit and is advantageously mounted at least partially so as to be movable relative to the closing unit, which unit is, in particular, provided for moving the closing unit, in particular relative to the fluid channel, advantageously under the influence of a magnetic field, in particular, preferably of a magnet unit, the armature unit is advantageously provided for moving the closing unit into at least defined valve positions, in particular into an open position, the armature unit furthermore being, at least partially, preferably at least partially, and particularly preferably completely, formed from a magnetizable, preferably ferromagnetic material, the armature element advantageously being formed integrally with at least components of the closing unit, in particular with the closing element .

Such a valve device with advantageous operating characteristics can be provided by means of such a configuration of the invention. In particular, temperature-induced deformations and/or plasticization of the sealing element made of an elastomer material can be advantageously avoided, as a result of which an advantageously long-lasting sealing action can be achieved.

In addition, it is proposed that the compensation unit comprises at least spring elements which are provided for applying a spring force to the sealing element in the direction of the sealing seat, in particular the spring elements are provided for at least substantially loading forces of the sealing element against the sealing seat in the closed operating state in order to seal the fluid duct, it is proposed in preferred configurations of the invention that the spring elements are formed by a diaphragm having a spring function, the force acting on the sealing element is in particular composed of a constant force, which is generated by the contour of the diaphragm, and a variable force, which is dependent on a pre-pressure acting on the inner side of the diaphragm in the inflow duct of the valve device.

In particular, the stop sleeve is connected to the armature unit in terms of operation by means of an armature tappet, the stop sleeve has an at least substantially cylindrical outer contour, the stop sleeve has a recess extending along a central axis of the stop sleeve, the recess is designed as a blind recess, the recess has an opening oriented in the direction of the seal seat and/or the inflow duct, the inner diameter of the opening is in particular greater than the outer diameter of the inflow duct.

In addition, it is proposed that the stop sleeve comprises at least driver elements which are fastened to the stop sleeve and are provided for compressing the spring element in the open state, the driver elements being arranged in particular directly at the opening of the stop sleeve, the driver elements being arranged in particular on the inner side of the stop sleeve, the driver elements being in particular designed as driver rings which can be pressed in particular into the stop sleeve, the driver elements being in particular provided for compressing the spring element during the opening movement of the stop sleeve, in the closed state, the spring contact surfaces of the driver elements being spaced apart from the driver element contact surfaces of at least spring elements.

The fuel cell system is provided with a valve device, which is arranged in particular in an anode path of the fuel cell system, the valve device being provided in particular for regulating a fuel gas flow, in particular a hydrogen gas flow, in the anode path, whereby an advantageously long service life of the fuel cell system can be achieved, in particular on the basis of a long service life of the valve device.

The valve device according to the invention should not be limited to the applications and embodiments described above. The valve device according to the invention can have a number deviating from the number described here of the individual elements, components and units, in particular in order to satisfy the operating modes described here.

Drawings

Further advantages result from the following description of the figures. Embodiments of the invention are illustrated in the drawings. The figures, description and claims contain a number of combined features. The person skilled in the art can also, in line with the objective, consider the features individually and summarize them into meaningful further combinations.

The figures show:

figure 1 is a schematic diagram of a fuel cell system having a valve arrangement in the anode path,

figure 2 shows the valve device in the closed state,

figure 3 shows the valve device in the open state,

alternative closing units of the valve device of fig. 4, an

An alternative closure unit for the valve device of fig. 5.

Detailed Description

Fig. 1 shows a simplified schematic of a fuel cell system 38a, the fuel cell system 38a having at least fuel cells 40a, which have an anode 42a and a cathode 44a, furthermore, the fuel cell system 38a has an anode path 46a and a cathode path 48a, the anode path 46a being provided for supplying a fuel gas, in particular hydrogen, to the anode 42a of the fuel cell 40a, the cathode path 48 being provided for supplying an oxidizing gas, in particular air, to the cathode 44a of the fuel cell 40a, furthermore, the fuel cell system 38a has a valve device 10a arranged in the anode path 46a, which valve device is provided for regulating the fuel gas flow in the anode path 46 a.

Fig. 2 and 3 show a valve device 10a in a schematic representation, fig. 2 shows a valve device 10a in a closed state, fig. 3 shows a valve device 10a in an open state, the valve device 10a having a closing unit 12a which is provided for fluid-tight closing of a fluid channel 14a from an inlet channel 50a to an outlet channel 52a in the closed state, the closing unit 12a furthermore having a sealing element 16a which is provided for sealing abutment against a sealing seat 18a in the closed state, the sealing element 16a being formed at least substantially from an elastomer material, furthermore, the valve device 10a has an armature unit 20a which comprises at least armature elements 22a and is provided for moving the sealing element 16 a.

The closing unit 12a has at least pot-shaped stop sleeves 30a, which are provided for bearing against the sealing seat 18a in the closed state, furthermore, the stop sleeves 30a are provided for receiving the sealing element 16a, the stop sleeves 30a are connected to an armature tappet 54a of the armature unit 20a, which forms units with the armature element 22a, the stop sleeves 30a and the sealing element 16a are pressed in the closed state by an armature spring 56a against the sealing seat 18a via the armature tappet 54a, the sealing seat 18a is configured as a flat seat, the armature 54a is guided centrally within a valve housing 58a of the valve device 10a above and below the armature element 22a, a magnet and a coil (not shown in detail) of the armature unit 20a is embedded in the valve housing 58a and radially surrounds the armature element 22a, and in the closed state the spring force of the armature spring 56a is introduced into the pot-shaped stop sleeves 30a and presses the sealing sleeves 30a and the sealing element 16a against the sealing seat 18.

The valve device 10a comprises a compensation unit 24a which is provided for compensating for deformations of the sealing element 16 a. The compensating unit 24a has a spring element 26a, which is provided for exerting a spring force on the sealing element 16a in the direction of the sealing seat 18 a. The spring element 26a is formed by a diaphragm 28a with spring capacity. The diaphragm 28a is enclosed in a pot-shaped stop sleeve 30a by a particularly complementarily engaging and/or pressed-in driving element 32 a. The driving element 32 is designed as a driving ring. The membrane 28 has an inwardly projecting flange 60 on which the sealing element 16a is arranged. The sealing element 16a is bonded to the flange 60a, for example. The driver element 32a is positioned in the axial direction in such a way that it is ensured in any case that the sealing element 16a fits on the sealing seat 18a and thus decouples the inflow channel 50a from the outflow channel 52 a. The axial positioning of the driver element 32a is selected in such a way that a play-free engagement of the sealing element 16a on the sealing seat 18a is ensured even in the case of maximum temperature-induced compression and maximum plasticization of the sealing element 16 a.

The sealing force 62 pressing the sealing element 16a against the sealing seat 18a consists of a constant -th force 64a and -th second force 66a, the -th force 64a being generated by the contour of the diaphragm 28a, the second force 66a being dependent on the preload prevailing in the inflow channel 50a, the diaphragm contour being dimensioned such that the second force 66a acts only in the maximum sealing cross section 68a in the closing direction and thus increases the sealing force 62a with increasing preload, the sealing element 16a being loaded with the smallest sealing force 62a if the preload drops to approximately zero, the largest component of the force of the armature spring 56a being introduced via the stop sleeve 30a onto the sealing seat 18a, the sealing element 16a consisting of an elastomer material being subjected to the smallest compression and thus to a temperature-dependent deformation to a minimum, since the lowest temperature is most likely to exist in the closed state and the spring contact surface 34a of the

entraining element

32a, 32b and the preload force 34a of the spring 26a are greater than the maximum distance of the entraining surface 36a of the sealing element 16a in the closed state.

If fuel gas is to be introduced from the inlet channel 50 into the outlet channel 52a, the armature unit 20a is excited so that an opening force is formed at the armature element 22a, the introduction of fuel gas into the outlet channel 52a only begins when the driver stroke 70a is exceeded, the projection 60 is supported on the driver element 32a from the point of reaching the driver stroke 70a in such a way that the unloading of the spring preload of the diaphragm 28a is inhibited at , the sealing element 16a is lifted off the sealing seat 18a and an inflow from the inlet channel 50a into the outlet channel 52a is permitted at the point of further movement of the stop sleeve 30a, the driver stroke 70a must be limited to a minimum value, which must compensate for the maximum possible degree of deformation of the sealing element 16a, in order to keep the effective armature stroke 74a as small as possible.

Two further embodiments of the invention are shown in fig. 4 and 5. The following description and the figures are substantially limited to the differences between the exemplary embodiments, wherein reference can in principle also be made to the drawings and/or descriptions of further exemplary embodiments, in particular fig. 1 to 3, with regard to identically numbered components, in particular with regard to components having the same reference numerals. To distinguish between these embodiments, the letter a is placed after the reference numerals of the embodiments in fig. 1 to 3. In the embodiment of fig. 4 and 5, the letter a is replaced by the letters b and c.

Fig. 4 shows a partial view of variants of a closing unit 12b of a valve device 10b, not shown in detail here, the closing unit 12b has at least pot-shaped stop sleeves 30b, which are provided in the closed state for bearing against a sealing seat 18b, the stop sleeves 30b are furthermore provided for receiving a sealing element 16b, which is configured as a sealing ring, the valve device 10b comprises a compensation unit 24b, which is provided for compensating for a deformation of the sealing element 16a, the compensation unit 24b has a spring element 26b, which is provided for exerting a spring force on the sealing element 16b in the direction of the sealing seat 18b, the spring element 26b is formed by a diaphragm 28b having spring capacity, the closing unit 12b has an intermediate plate 76b, which is arranged in the stop sleeve 30b, the sealing element 16b is arranged on the underside of the intermediate plate 76b, a diaphragm 28b is fixed on the upper side of the intermediate plate 76b, the intermediate plate 76b has a slot 78b, which enables a preload force to be exerted on the diaphragm 28b in the inflow channel 50 b.

Fig. 5 shows a partial view of variants of the closing unit 12c of the valve device 10c, which are not shown in detail here, the closing unit 12c has at least pot-shaped stop sleeves 30c, which are provided in the closed state for bearing against the sealing seat 18c, the stop sleeves 30c are furthermore provided for receiving the sealing element 16c, the valve device 10c comprises a compensation unit 24c, which is provided for compensating for a deformation of the sealing element 16c, the compensation unit 24c has a spring element 26c, which is provided for exerting a spring force on the sealing element 16c in the direction of the sealing seat 18a, the spring element 26c is formed by a diaphragm 28c having a spring function, the closing unit 12c has an intermediate plate 76c, which is arranged within the stop sleeve 30c over the entire surface, the sealing element 16c is arranged on the underside of the intermediate plate 76c, the intermediate plate 76c is fixed on the upper side of the intermediate plate 76c, the diaphragm 28c and the sealing element 16c have a continuous diaphragm 78c, which enables a pre-pressure in the opening 50c to act on the diaphragm 28 c.

Claims

1, A valve device, the valve device having:

-at least closing units (12 a; 12 b; 12c) which, in at least valve positions, are provided for fluid-tight closing of at least fluid passages (14 a; 14 b; 14c) and which comprise at least sealing elements (16 a; 16 b; 16c) which are provided for sealing abutment against sealing seats (18 a; 18 b; 18c), and

an armature unit (20 a; 20 b; 20c) having at least armature elements (22 a; 22 b; 22c) and being provided for moving the sealing element (16 a; 16 b; 16c) in directions of movement,

characterized in that a compensation unit (24 a; 24 b; 24c) is provided, which is provided for compensating at least deformations of the at least sealing elements (16 a; 16 b; 16 c).

2. A valve device according to claim 1, characterized in that the compensating unit (24 a; 24 b; 24c) comprises at least spring elements (26 a; 26 b; 26c) which are arranged for exerting a spring force on the sealing element (16 a; 16 b; 16c) in the direction of the sealing seat (18 a; 18 b; 18 c).

3. Valve device according to claim 2, characterized in that the spring element (26 a; 26 b; 26c) is constituted by a diaphragm (28 a; 28 b; 28c) having spring capacity.

4., valve device according to the preceding claim, characterized in that the closing unit (12 a; 12 b; 12c) has at least stop sleeves (30 a; 30 b; 30c) which are provided for resting against the sealing seat (18 a; 18 b; 18c) at least in the closed state and for receiving the sealing element (16 a; 16 b; 16 c).

5. A valve device according to claim 4, characterized in that said at least sealing elements (16 a; 16 b; 16c) are supported in a linearly movable manner relative to said stop sleeve (30 a; 30 c; 30 d).

6. A valve device according to claim 4 or 5, characterized in that the stop sleeve (30 a; 30 b; 30c) is at least substantially pot-shaped and radially surrounds the sealing element (16 a; 16 b; 16c) at least in the closed state.

7. Valve device according to at least claims 2 and 4, characterized in that the closing unit (12 a; 12 b; 12c) comprises at least driving elements (32 a; 32 b; 32c) which are fixed on the stop sleeve (30 a; 30 b; 30c) and are provided for compressing the spring element (26 a; 26 b; 26c) in the open state.

8. Valve device according to at least claim 4, characterized in that the spring contact surface (34 a; 34 b; 34c) of the driver element (32 a; 32 b; 32c) is spaced apart from the driver element contact surface (36 a; 36 b; 36c) of the spring element (26 a; 26 b; 26c) in the closed state.

9. A valve device according to claim 8, characterized in that the distance between the spring abutment surface (34 a; 34 b; 34c) and the driving element abutment surface (36 a; 36 b; 36c) is larger in the closed state than the maximum deformation of the sealing element (16 a; 16 b; 16 c).

10, fuel cell system having at least valve arrangements (10 a; 10 b; 10c) according to any of the preceding claims .