The invention relates to a gas valve unit for setting gas volumetric flows to a twin-circuit gas burner of a gas appliance, in particular a gas cooking appliance, wherein the gas valve unit has a gas inlet and two gas outlets.
In gas cooking appliances gas burners are frequently used, which have two concentrically disposed rings with gas outlet openings. During operation of the gas cooktop a ring of flame can burn at each of the rings with gas outlet openings. If the gas volumetric flows to both rings with gas outlet openings can be set separately from one another, said gas burners are referred to as twin-circuit gas burners. Twin-circuit gas burners generally have a greater maximum thermal output than conventional gas burners with just one ring of flame. Twin-circuit gas burners also have a particularly good spread between minimum thermal output and maximum thermal output. At maximum thermal output both rings of flame burn with the largest flames possible. At minimum thermal output only the smaller ring of flame burns with the smallest flames possible, while no gas flows out of the larger ring with flame outlet openings.
Gas valves for supplying twin-circuit gas valves have a gas inlet, with which the gas valve is connected to a main gas line of the gas cooking appliance. A first gas outlet of the gas valve opens into a first gas sub-line leading to the smaller ring with gas outlet openings. A second gas outlet is connected to a gas sub-line leading to the larger ring with gas outlet openings.
Twin-circuit gas valves have a single actuation element, which can be used to set both the gas flow to supply the first ring of flame and the gas flow to supply the second ring of flame. According to a standard model the completely closed position of the twin-circuit gas valve is followed immediately by the switching position for maximum output of both rings of flame. Further actuation of the operating element initially reduces the output of the larger ring of flame, until it is extinguished completely. The output of the smaller ring of flame is then reduced, until it reaches its minimum output. With this embodiment either the twin-circuit gas valve is completely closed or only the gas flow to the smaller ring with gas outlet openings is opened or the gas flow to both rings with gas outlet openings is opened, depending on the position of the actuation element. However provision is not made for closing the gas flow to the smaller ring with gas outlet openings, while the gas flow to the larger ring with gas outlet openings is open.
Known gas valve units for twin-circuit gas burners are generally embodied as plug valves, in which a valve plug is rotated in a valve housing by means of the actuation element. It has proven difficult to set a desired thermal output precisely and reproduce such a setting with such known valves.
The object of the present invention is to supply a generic gas valve unit, which can be set more easily.
According to the invention this object is achieved in that the gas volumetric flow to at least one of the gas outlets can be set in a multiple-stage manner, in a zero position of the gas valve unit the gas volumetric flow to both gas outlets is interrupted and in a switching position adjacent to the zero position the gas volumetric flow, which can be set in a multiple-stage manner, is set to a maximum value. The gas volumetric flow can thus be set precisely and in a reproducible manner in multiple stages. The switching stage at which the gas volumetric flow is at a maximum is immediately adjacent to the zero position of the gas valve unit here. When the gas valve unit is opened, the gas volumetric flow is therefore set immediately to a maximum value. This ensures that the gas-conducting components behind the gas valve unit fill with gas quickly. Also ignition of the gas burner is particularly reliable at maximum gas volumetric flow. The gas valve unit is therefore in an optimum position for ignition of the gas burner immediately after opening.
It is further advantageous, if in a switching position adjacent to the zero position the gas volumetric flow, which can be set in a multiple-stage manner, is set to a maximum value and the gas volumetric flow to the other gas outlet is also opened. Once the gas valve unit has been opened, the gas flow to both gas outlets is therefore immediately opened.
It is particularly advantageous for the gas volumetric flows to both gas outlets to be able to be set in a multiple-stage manner, with both gas volumetric flows being set to a maximum value in a switching position adjacent to the zero position. This means that all the gas-conducting components behind the gas valve unit are filled with gas particularly quickly. Ignition of the gas burner takes place in the switching position adjacent to the zero position with maximum gas output from all gas outlet openings.
To set the gas volumetric flow supplied to a first gas outlet the gas valve unit has at least two open/close valves and at least two first throttle points, preferably at least three first open/close valves and at least three first throttle points. The number of open/close valves and the number of throttle points determine the number of available switching stages. The more switching stages there are available, the more precisely the thermal output of the gas burner assigned to the gas valve can be set.
Similar advantages emerge when the gas valve unit has at least two second open/close valves and at least two second throttle points, preferably at least four second open/close valves and at least four second throttle points for setting the gas volumetric flow supplied to a second gas outlet.
To control the open/close valves at least one magnetically active body is provided, which can be moved relative to the open/close valve. A magnetically active body can be for example a permanent magnet, which is able to attract a ferromagnetic valve body of the open/close valve. Likewise the magnetically active body can be a ferromagnetic body that is not permanently magnetized, if a valve body of the open/close valve is formed by a permanent magnet or connected to a permanent magnet. The open/close valves are opened or closed by moving the magnetically active body relative to the open/close valves. A magnetic force only acts between the magnetically active body and the open/close valve to open the open/close valve, when the magnetically active body is in direct proximity to the open/close valve.
In one advantageous embodiment of the invention at least two magnetically active bodies are provided to control the open/close valves, with a first magnetically active body being formed by a ferromagnetic body and the second magnetically active body being formed by a permanent magnet.
The first magnetically active body and the second magnetically active body here are coupled to one another in such a manner that they can be moved synchronously with the open/close valves. The coupling is preferably embodied in such a manner that the two magnetically active bodies are necessarily always moved synchronously with one another.
At least one first open/close valve has a permanent magnet, such that said first open/close valve can be controlled as a function of the position of the first magnetically active body, which is formed by a ferromagnetic body. The other open/close valves, which do not have permanent magnets, can in contrast not be controlled by the first magnetically active body, which has a ferromagnetic body.
It is further advantageous, if the first magnetically active body, which is formed by a ferromagnetic body, is embodied such that it brings about an opening of the open/close valve, which has a permanent magnet, in at least three switching positions of the gas valve unit. The open/close valve, which has a permanent magnet, is therefore opened in a number of switching positions of the gas valve unit, unlike the other open/close valves.
Immediate complete opening of the gas valve unit is achieved in that in a switching position adjacent to the zero position the first magnetically active body, which is formed by a ferromagnetic body, opens the first open/close valve, which has a permanent magnet, and the second magnetically active body, which is formed by a permanent magnet, opens a second open/close valve.
In every switching position, in which the second magnetically active body, which is formed by a permanent magnet, opens at least one second open/close valve, the first magnetically active body, which is formed by a ferromagnetic body, opens the first open/close valve, which has a permanent magnet. This ensures that in the case of a twin-circuit gas burner the outer ring of flame does not burn alone at any time, while the inner ring of flame is not supplied with gas. Instead the inner ring of flame always burns with the outer ring of flame.
In at least one switching position, in which the second magnetically active body, which is formed by a permanent magnet, opens at least one first open/close valve, the first magnetic body does not open any of the open/close valves. None of the second open/close valves is open in such a switching position either. The first magnetically active body has no function in these switching positions.
Depending on the position of the second magnetically active body, which is formed by a permanent magnet, said second magnetically active body either does not open any open/close valve or opens just one open/close valve or opens just two open/close valves. The second magnetically active body does not open any open/close valve when the gas valve unit is in the zero position. The second magnetically active body opens just one open/close valve when it is located directly above the open/close valve. The second magnetically active body opens just two open/close valves in intermediate positions between two open/close valves. It is however ensured that when switching between two switching positions of the gas valve unit, all the open/close valves are never closed at the same time, thereby extinguishing the flames at the gas burner.
In one preferred embodiment the gas valve unit comprises a first throttle section, in which the first throttle points are disposed in a row, having a connecting segment between each set of two adjacent first throttle points, which a first open/close valve in the opened state connects to the gas inlet.
Similarly the gas valve unit comprises a second throttle section, in which the second throttle points are disposed in a row, having a connecting segment between each set of two adjacent throttle points, which a second open/close valve in the opened state connects respectively to the gas inlet.
The throttle points of the first throttle section—when viewed in the gas flow direction in the first throttle section—have an increasing flow cross section. The gas volumetric flow to the gas outlet is therefore only significantly determined by the first throttle point present in the gas flow. The subsequent throttle points in the gas flow direction have a larger flow cross section and hardly influence the volumetric flow at all.
Similarly the throttle points of the second throttle section—when viewed in the gas flow direction of the second throttle section—also have an increasing flow cross section.
Further advantages and details of the invention are described in more detail with reference to the exemplary embodiment illustrated in the schematic figures, in which:
The second magnetically active body 6 is formed by a permanent magnet, which can be moved from the illustrated zero position counterclockwise about an axis 8. The first magnetically active body 5 is connected to the second magnetically active body 6 in such a manner that it is moved about the axis 8 together with the second magnetically active body 6. The first magnetically active body 5 is made of a ferromagnetic material and is therefore not a permanent magnet. The characterizing property of a ferromagnetic material is that it is not magnetic itself but it is attracted by a magnet. In the present exemplary embodiment the first magnetically active body 5 is formed by a C-shaped steel sheet and is shown transparently hatched in
All the second open/close valves 16 and all the first open/close valves 15, with the exception of the first open/close valve 15.3, have non-magnetic ferromagnetic valve bodies. The open/close valve 15.3 has a valve body in the form of or connected to a permanent magnet 13. The second magnetically active body 6 formed by a permanent magnet can exert an attraction force on the valve bodies of all the first open/close valves 15, including the open/close valve 15.3, the permanent magnet 13 of which is correspondingly polarized, and of all the open/close valves 16, when it is positioned above the corresponding valve body.
The first magnetically active body 5 can only exert an attraction force on the valve body of the open/close valve 15.3, which is embodied as a permanent magnet 13 or is coupled to such. This always happens when a part of the first magnetically active body 5 is located above said open/close valve 15.3.
The basic structure of the inventive gas valve, in particular the manner of interaction of the second magnetically active body 6 with the associated open/close valves 15 and 16 and the conducting of gas in the interior of the gas valve, corresponds to the structure of the subject matter of the European patent applications 09290589.2, 09290590.0 and 09290591.8 submitted on Jul. 27, 2009.
In the position illustrated in
The circuit in the interior of the twin-circuit gas valve 2 is described below with reference to the schematic
If the two coupled magnetically active bodies 5, 6 are moved to the right in the drawing from the position according to
This switching position is illustrated in
If the magnetically active bodies 5, 6 move further to the right in the drawing, the second magnetically active body 6 then also opens the second open/close valve 16.5. The movement of the first magnetically active body 5 to the right however does not cause the opening of a further first open/close valve 15.2 or 15.3, as these do not have permanent magnets.
This switching position is illustrated in
If the magnetically active bodies 5, 6 are moved further to the right in the drawing, the open/close valve 16.6 closes and only the open/close valve 16.5 remains open.
This switching position is illustrated in
In the switching position illustrated in
If the two magnetically active bodies 5, 6 are now moved further to the right, the first open/close valves 15 close and open one after the other. This is solely due to the magnetic force of the second magnetically active body 6. In these switching positions the first magnetically active body 5 then has no switching function.
The first open/close valve 15.2 also initially opens here according to
In contrast in the switching position according to
On actuation of the twin-circuit gas valve 2 in the opposite direction both magnetically active bodies 5, 6 are moved back. The movement of the two magnetically active bodies 5, 6 is always synchronous here too. In the process the gas flow to the first gas outlet 11 is first enlarged and then the gas flow to the second gas outlet 12. Once the gas flow to both gas outlets 11, 12 has reached its maximum value, the twin-circuit gas valve is completely closed in the following switching position.
Actuation of the twin-circuit gas valve 2 is effected using a suitable movement apparatus. This can comprise a manually actuatable rotary toggle for example. Rotation of the rotary toggle then displaces the magnetically active body 5, 6 relative to the open/close valves 15, 16 in the manner described above.
Alternatively it is also possible to equip the movement apparatus with a suitable control element, for example an electric stepper motor or a combination of electric motor and gear unit. This control element can then be activated by means of a suitable electronic controller. The electronic controller then actuates the control element automatically or according to the output signal of an electronic user interface connected to the controller, which can be formed for example by touch sensors, sliders or detachable magnetic toggles. The electronic controller can also be used for partially or fully automatic control of the gas valve unit.
Number | Date | Country | Kind |
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10290271 | May 2010 | EP | regional |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2011/057481 | 5/10/2011 | WO | 00 | 11/8/2012 |
Publishing Document | Publishing Date | Country | Kind |
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WO2011/144492 | 11/24/2011 | WO | A |
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20130059256 A1 | Mar 2013 | US |