HK1172675B - Structure of a gas valve unit - Google Patents

Description

Structure of air valve unit

The invention relates to a gas valve unit for regulating the gas volume flow supplied to a gas burner of a gas appliance, in particular a gas cooking appliance, wherein the gas valve unit has a valve body in which at least two valve seats of an opening/closing valve of the gas valve unit are formed, in which at least two throttle points each having at least one throttle opening are formed.

Gas valve units of the type described are described, for example, in publications EP 0818655 a2 and WO 2004063629 a 1. The gas valve unit can be used to control the gas volume flow to the gas burner of the gas cooking appliance in a plurality of stages. The gas volume flow here has a reproducible magnitude at any stage. The throughflow cross section of the gas valve unit is adjusted overall, and thus the size of the gas volume flow, in that certain opening/closing valves of the gas valve unit are opened or closed, so that the gas flow through certain throttle openings is opened or interrupted.

Known gas valve units of the type described are of cumbersome design and are only suitable for being operated by means of an electronic control unit. Here, each opening/closing valve is assigned an electromagnetic mechanism which is controlled by an electronic control unit and opens or closes the respective opening/closing valve.

The object of the invention is to provide a gas valve unit of the type mentioned in the introduction which can be produced easily.

According to the invention, this object is achieved in that the valve body has a plurality of plates arranged parallel to one another, wherein the valve sealing plate forms a valve seat of the open/close valve and a throttle opening of the throttle point is provided on the throttle plate. The valve body includes a plurality of plates stacked one on top of the other. The plates abutting against each other are sealed against each other, so that no gas can escape through the parting line between the two plates abutting against each other. On these plates there are provided gas channels, for example holes or slits, formed by openings, through which gas can flow in a direction perpendicular to the plates and, in the case of slits, also parallel to the relevant plates. According to the invention, one of the plates is designed as a valve sealing plate which forms a valve seat for the open/close valve. The other plate is designed as a throttle plate with throttle openings with a precisely defined cross section. This cross section determines the gas volume flow through the throttle point to which the throttle opening belongs when the respective open-close valve is open.

The tightness of the closed open-close valve is ensured in that the valve sealing plate is made of a flexible material, for example plastic. In this case, the sealing performance of the open-close valve can be ensured even if the closing force of the open-close valve is small.

Each open-close valve has a blocking body which rests against the valve sealing plate when the open-close valve is closed. The blocking body is detached from the valve sealing plate when the open-close-valve is opened. The valve sealing plate has an opening in the region of each valve seat, which opening is closed by a blocking body resting on the valve sealing plate when the open-close valve is closed. The opening forms a passage from the top surface to the bottom surface of the valve sealing plate and enables gas to flow through the valve sealing plate if the blocking body is disengaged from the valve sealing plate. While the blocking body resting on the valve sealing plate closes the relevant opening completely.

According to a particularly advantageous embodiment of the invention, the force of the at least one permanent magnet can be used to displace the blocking body of the open/close valve. The permanent magnet is preferably part of the gas valve unit and is moved relative to the blocking body, for example by manual operation by an operator or by means of an electric motor. The movement of the permanent magnet is preferably performed parallel to the plates of the gas valve unit, i.e. perpendicular to the direction of movement of the blocking body. If the permanent magnet is located above the blocking body, the blocking body is attracted by the permanent magnet and in this case is detached from the valve sealing plate.

The open-close valve also has a spring, with which the blocking body of the open-close valve is prestressed against the valve sealing plate. The force of the spring defines the rest position of the blocking body and closes the open-close valve independently of the installation position of the gas valve unit. When opening the open-close valve, the blocking body is disengaged from the valve sealing plate against the spring force, for example, by the magnetic force of a permanent magnet. The open/close valve can also be opened by a direct mechanical coupling, for example by means of a camshaft.

An advantageous development of the invention provides that a pressure plate, which is made of a substantially rigid material, for example metal, is provided on the side of the valve sealing plate facing away from the blocking body. The pressure plate forms a planar base cushion of the valve sealing plate and prevents the valve sealing plate from undesirably deforming, e.g., buckling.

The pressure plate has openings that correspond to the openings in the valve seal plate. The opening in the pressure plate forms a continuation of the opening in the valve sealing plate.

Preferably, the throttle plate is constructed primarily of a rigid material, such as metal, preferably brass or stainless steel. The throttle openings in the throttle plate have a precisely defined opening cross section. For this reason, it is not desirable for the throttle plate to deform elastically. The use of metal, preferably brass or stainless steel, allows for precise machining of the throttle plate and allows for simple manufacture of the throttle orifice.

It is particularly advantageous to provide a first gas distribution plate with openings between the pressure plate and the throttle plate, which openings correspond to the openings in the pressure plate and to the throttle openings in the throttle plate. The gas distribution plate thus enables gas to be guided from the openings in the pressure plate to the associated chokes in the chokes plate. At least a part of the openings on the first gas distribution plate also respectively connect two adjacent chokes of the chokes to each other. The openings in the first gas distribution plate thus enable not only a flow perpendicular to the gas distribution plate but also a flow parallel to the gas distribution plate, so that gas can flow from one restriction of the restriction plate to an adjacent restriction of the restriction plate.

Furthermore, a second gas distributor plate with openings is provided on the side of the throttle plate facing away from the first gas distributor plate, which openings correspond to the throttle openings in the throttle plate. Gas can thus flow from the throttle openings of the throttle plate to the openings of the second gas distribution plate.

At least a part of the openings on the second gas distribution plate respectively connect two adjacent chokes of the chokes to each other. The second gas distribution plate thus also enables gas to flow between two adjacent chokes of the choke plate. As with the openings in the first gas distributor plate, the openings in the second gas distributor plate can be configured as long holes for this purpose.

The arrangement of the openings in the second gas distribution plate is suitably chosen such that the openings in the second gas distribution plate connect two adjacent chokes in the choke plate, respectively, which are not connected by the first gas distribution plate. The throttle openings on the throttle plate are connected in series through two gas distribution plates. Gas can flow through each choke in succession, wherein the connection between two side-by-side chokes is established alternately by a first gas distribution plate and a second gas distribution plate.

Preferably, the first gas distribution plate and/or the second gas distribution plate are made of a flexible material, such as plastic. Due to the use of flexible material, the gas distributor plates are reliably sealed against the throttle plate, so that no gas can escape from the parting line between the gas distributor plate and the throttle plate.

Opening the open-close valves corresponding to the respective openings allows the openings of the first gas distribution plate to be connected substantially unthrottled with the gas inlets of the gas valve unit. The opening/closing valve, the openings in the valve sealing plate and the openings in the pressure plate have no significant throttling function and have a significantly larger flow cross section than the throttling opening.

The second gas distribution plate is provided with an opening which is connected with the gas outlet of the gas valve unit. The entire gas flow through the gas valve unit thus flows through at least the last throttle opening of the throttle plate, which opens into the opening of the second gas distribution plate, which opening is connected to the gas outlet. The last orifice of the throttle plate has a particularly large cross section compared to the other orifices, so that it has no throttling effect or only a small throttling effect. Depending on which open-close-valve is open, the gas flowing through the gas valve unit flows through only the last orifice, a plurality of orifices or all orifices of the gas valve unit.

The plates of the valve body of the air valve unit are stacked up and down. In addition to the above-described plates, there are also other plates, if necessary, which are, for example, sealing plates, intermediate plates or pressure plates.

In the mounted state, the plates are not movable relative to each other. The gas volume flow is regulated only by the movement of the valve body of the open-close valve. The plates are neither movable parallel to each other nor rotatable relative to each other, nor disengaged from each other during operation.

The at least one throttle plate may be replaced during operation of the retrofit gas valve unit. For example, the throttle screen needs to be replaced in order to adapt the gas valve unit to the type of gas used. The gas types commonly used are natural gas, liquefied gas or town gas. The throttle plate can also be replaced if the gas valve unit is to be adapted to a burner with a greater or lesser power. The different throttle plates differ by the different throughflow cross sections of the different throttle openings.

According to an advantageous embodiment of the valve unit, the shut-off body of the open/close valve and/or the openings in the valve sealing plate and/or the openings in the pressure plate and/or the openings in the first gas distributor plate and/or the openings in the throttle plate and/or the openings in the second throttle plate are arranged substantially on a circular path. In this case, the permanent magnet for operating the valve unit also moves on a circular trajectory at a short distance above the blocking body. The permanent magnet can then be arranged, for example, on the stem.

Advantageous designs and improvements of the invention will be described in detail with the aid of the embodiments shown in the schematic drawings.

Fig. 1 shows a schematic switching arrangement of a gas valve unit, in which a first open-close valve is open;

fig. 2 shows a schematic switch arrangement in which two open-close-valves are open;

fig. 3 shows a schematic switch arrangement in which the last open-close-valve is open;

fig. 4 shows a schematic structure of the air valve device in which the open-close-valve is closed;

FIG. 5 shows a schematic configuration in which there is one open-close-valve open;

fig. 6 shows a schematic configuration in which the first two open-close-valves are open;

FIG. 7 shows a schematic configuration in which there is one open-close-valve open;

fig. 8 shows a schematic configuration in which the last open-close-valve is open;

fig. 9 shows a schematic structure of a modification of the gas valve unit;

fig. 10 is a perspective view of the air valve unit viewed from obliquely above;

fig. 11 is a perspective view of an open-close-valve;

fig. 12 is a perspective view of the air valve unit viewed obliquely from below;

FIG. 13 is a perspective view of the lower gas distribution plate;

fig. 14 is an exploded view of the air valve unit viewed obliquely from below;

fig. 15 shows a variant of the switch arrangement according to fig. 1 to 3 in the fully closed state;

fig. 16 shows a variant of the switch arrangement in the fully open state, in which one open-close-valve is open;

fig. 17 shows a variant of the switch arrangement in the fully open state, in which two open-close-valves are open;

fig. 18 shows a variant of the switch arrangement in a partially open state;

fig. 19 shows a variant of the switch arrangement in the minimally open state.

Fig. 1 shows a switch arrangement of a gas valve unit of the present invention. A gas inlet 1 is visible, through which the gas valve unit is connected, for example, to the main gas line of the gas cooking appliance. At the gas inlet 1 there is gas for combustion, which is at a constant pressure, for example 20 mbar or 50 mbar. A gas line, for example, leading to a gas burner of a gas cooking appliance, is connected to the gas outlet 2. The gas inlet 1 is connected via the gas inlet chamber 9 of the gas valve unit to the inputs of the five open-close valves 3 (3.1 to 3.5) in the present exemplary embodiment. By opening the open/close valve 3, the gas inlet 1 is connected in each case to a part of the throttle section 5 into which gas flows via the open/close valve 3. The throttle section 5 comprises an inlet section 7 into which the first open/close valve 3.1 opens. The other open-close valves 3.2 to 3.5 open into a connecting section 6 (6.1 to 6.4) of the throttle section 5. The transition between the inlet portion 7 and the first connection portion 6.1 and the transition between two adjacent ones of the connection portions 6.1 to 6.4 are both formed by the throttle points 4 (4.1 to 4.5). The last throttle point 4.5 connects the last connecting part 6.4 to the gas outlet 2. The throttle points 4.1 to 4.5 have successively larger opening cross sections. The flow cross section of the last throttle point 4.5 can be dimensioned such that the last throttle point 4.5 has practically no throttle function.

The open-close valves 3 are actuated by means of permanent magnets 8, which are movable along the row of open-close valves 3. The force for opening the respective open-close valve 3 is formed here directly by the magnetic force of the permanent magnet 8. This magnetic force opens the corresponding open-close valve 3 against the elastic force.

In the switching position according to fig. 1, only the first on/off valve 3.1 is open. Via this open-close valve 3.1, the gas flows from the gas inlet chamber 9 into the inlet section 7 and from there on its way to the gas outlet 2 through the entire throttle point 4 and the entire connecting section 6. The gas flow through the valve unit determines the minimum power of the gas burner connected to the valve unit.

Fig. 2 shows a schematic switch arrangement in which the permanent magnet 8 is moved appropriately to the right in the drawing, so that both the first open-close valve 3.1 and the second open-close valve 3.2 are open.

Via the open second open/close valve 3.2, the gas flows directly from the gas inlet chamber 9 into the first connecting section 6.1 and from there along the throttle points 4.2 to 4.5 to the gas outlet 2. The gas flowing to the gas outlet 2 bypasses the first throttle point 4.1 as a result of the opening of the open/close valve 3.2. The gas volume flow in the switching position according to fig. 2 is therefore greater than the gas volume flow in the switching position according to fig. 1. In fact, gas flows only via the second open-close valve 3.2 to the first connection portion 6.1. Since the open-close valves 3.1 and 3.2 remain open, the same pressure level is generated in the inlet section 7 as in the first connecting section 6.1. No further gas therefore flows from the inlet section 7 via the first throttle point 4.1 into the first connection section 6.1. Thus, if the permanent magnet 8 is moved further to the right in the drawing and thus the first open-close valve 3.1 is closed with the second open-close valve 3.2 open, the overall gas volume flow through the gas valve unit is virtually unchanged.

The permanent magnet 8 is moved to the right in the drawing, whereby the open-close valves 3.2 to 3.5 are successively opened, thereby gradually increasing the gas volume flow through the gas valve unit.

Fig. 3 schematically shows the switching arrangement of the gas valve unit, which is in the maximum switching position. The permanent magnet 8 is here in its end position on the right side of the drawing. The gas flows here directly from the gas inlet chamber 9 into the last connecting section 6.4 and on its way to the gas outlet 2 only passes through the last throttle point 4.5. The last throttle point 4.5 can have a large flow cross section, so that in practice no throttling of the gas flow takes place, so that the gas can flow through the gas valve unit virtually without throttling.

Fig. 4 to 8 schematically show the structure of the gas valve unit in terms of configuration, and the switching arrangement thereof is as shown in fig. 1 to 3. A valve body 20 is visible, in which the gas inlet 1 of the gas valve unit protrudes. Inside the valve body 20 there is a gas inlet chamber 9 connected to the gas inlet 1. The blocking body 10 of the open-close valve 3 is guided in the valve body 20 such that it can move up and down in the drawing. Each blocking body 10 is pre-stressed downwards in the drawing by means of a spring 11. Each blocking body 10 can be moved upwards in the figure against the force of the spring 11 by means of the force of the permanent magnet 8. The spring 11 presses the blocking body against the valve sealing plate 12, so that the blocking body 10 closes the opening 12a in the valve sealing plate 12 in an air-tight manner. A pressure plate 13 is provided under the valve sealing plate 12, and an opening 13a of the pressure plate corresponds to the opening 12a of the valve sealing plate 12. The openings 13a in the pressure plate 13 open into the openings 14a in the first gas distribution plate 14. In the figure, below the first gas distribution plate 14 there is a throttle plate 15 with a plurality of throttle orifices 18. Each throttle point 4.1 to 4.4 is formed here by two throttle openings 18. The two throttle openings 18 belonging to one throttle point 4.1 to 4.4 are connected to each other via an opening 16a in the second gas distributor plate 16. While the openings 14a of the first gas distributor plate connect the two adjacent chokes 18 of the chokes 4.1 to 4.4 arranged side by side. The last throttle point 4.5 is formed by only one throttle opening 18, which opens into the gas outlet 2 of the gas valve unit via a corresponding opening 16a in the second gas distributor plate 16.

In the switching position according to fig. 4, the permanent magnet 8 is in the end position, in which all open-close valves 3 are closed. The gas valve unit is thus closed as a whole. The gas volume flow is equal to zero.

Fig. 5 shows a schematic structure of the gas valve unit, in which the first open-close valve 3.1 is open. Gas flows from the gas inlet 1 into the gas inlet chamber 9 and from there flows via the valve sealing plate 12, the pressure plate 13 and the first opening of the first gas distribution plate 14 to the throttle plate 15. On the way to the gas outlet 2, the gas flows through all the chokes 18 of the choke plate 15 and all the openings 14a of the first gas distribution plate 14 and all the openings 16a of the second gas distribution plate 16.

Fig. 6 shows a schematic configuration, in which the first open-close valve 3.1 is open and the second open-close valve 3.2 is open. Since the second open/close valve 3.2 is open, the throttle opening 18 of the first throttle point 4.1 is bypassed, so that the gas reaches the second throttle point 4.2 directly and flows through the further throttle points 4.3 to 4.5 on its way to the gas outlet 2. Since the first open/close valve 3.1 is open, the gas path through the first throttle point 4.1 opens. Since the pressure level is equal on both sides of the first throttle point 4.1, virtually no gas flows through the first throttle point 4.1.

Fig. 7 shows a schematic configuration in which the second open/close valve 3.2 is open. All remaining open-close valves 3.1 and 3.3 to 3.5 are closed. The gas volume flow through the gas valve unit is practically the same as the gas volume flow according to the valve positions of fig. 6.

The permanent magnet 8 and the components of the open-close valve 3 are coordinated with one another such that either exactly one open-close valve 3 or exactly two open-close valves 3 are open when the gas valve unit is open. During the switching from one open-close valve 3 to an adjacent open-close valve 3, two adjacent open-close valves 3 are always open for a short period of time. This ensures that the switchover does not result in a brief interruption of the gas supplied to the gas burner, which would result in a flashover or extinction of the gas flame. The adoption of the connection method also ensures that the phenomenon that the volume flow of the coal gas is temporarily increased in the switching process can not occur. Flashovers of the gas flame during the switching process are thus also reliably prevented.

Finally, fig. 8 shows a schematic representation of the gas valve unit, with only the last open-close valve 3.5 open. In this case, the gas flows virtually unimpeded from the gas inlet via the gas inlet chamber, the open on-off valve 3.5 and the last throttle opening 18 associated with it to the gas outlet.

Fig. 9 shows a schematic structure of a variant of the gas valve unit. In contrast to the design according to fig. 4 to 8, the gas outlet 2 here branches off directly from the first gas distribution plate 14. When the open-close valve 3.5 is open, gas flows without throttling via the gas inlet 1, the gas inlet chamber 9, the open-close valve 3.5, the last opening 12a in the valve sealing plate 12, the last opening 13a in the pressure plate 13 and the last opening 14a in the first gas distribution plate 14 to the gas outlet 2. The last throttle point 4.5 (see fig. 4 to 8) is not present in the variant according to fig. 9.

A perspective view of one embodiment of the gas valve unit from obliquely above is shown in fig. 10. A valve body 20 is visible, in which a switching shaft 21 of the valve unit is rotatably mounted. Coupled to the switching shaft 21 is a transmission 22 which transmits the rotational movement of the switching shaft 21 to the permanent magnet 8, so that the permanent magnet is guided on a circular path during the rotational movement of the switching shaft 21. The cover 27 forms a sliding surface of the permanent magnet 8 and creates a prescribed spacing between the permanent magnet 8 and the open-close valve 3. The gas outlet 2 and an actuating lever 23 for a not shown magnetic valve unit, which is arranged in the gas inlet 1, are also visible. The operating lever 23 is coupled to the switching shaft such that the operating lever 23 projects from the valve body 20 under the axial pressing action of the switching shaft. So that pressing the switching shaft 21 opens the magnetic valve unit. The bore 24 serves to fix the magnetic valve unit to the valve body.

Fig. 11 shows the view according to fig. 10, wherein the transmission piece 22, the permanent magnet 8, is omitted. Fig. 11 shows, in particular, the annularly arranged blocking body 10 of the open/close valve 3. Each blocking body 10 is provided with a spring 11 which presses the blocking body 10 downwards in the drawing. One of these springs 11 is exemplarily shown in fig. 11.

Fig. 12 is a perspective view of the air valve unit viewed obliquely from below. Here, in particular, a cover plate 17 is visible, which presses together the remaining plates not shown in the drawing, namely the valve sealing plate 12, the pressure plate 13, the first gas distributor plate 14, the throttle plate 15 and the second gas distributor plate 16. The force required for this purpose is generated by means of the screw 25.

Fig. 13 shows the view according to fig. 12 with the cover plate 17 removed. Here, a second gas distribution plate 16 with openings 16a can be seen. Through these openings 16a parts of the throttle screen 15 and the throttle openings 18 located thereon are visible. It can also be seen that every two chokes 18 are connected by an opening 16a of the second gas distribution plate 16.

The exploded view 14 shows the layered structure of the air valve unit. Here, a valve body 20 is visible, which has a guide bore 26 for the shut-off body 10, not shown in this view, of the on/off valve 3. The following plates are inserted into the valve body 20 in the following order: valve sealing plate 12, pressure plate 13, first gas distribution plate 14, throttle plate 15, second gas distribution plate 16 and cover plate 17. The bolts 25 press the plates 12, 13, 14, 15, 16, 17 supported on the valve body 20 together.

In the present embodiment, the plates 12, 13, 14, 15, 16, 17 are individually inserted into the valve body 20, respectively. However, it is also possible to pre-manufacture the plates 12, 13, 14, 15, 16, 17 in groups such that they can only be jointly inserted into the valve body 20 and removed again. Depending on the design, either only the throttle plate 15 has to be replaced or the entire group of plates 12, 13, 14, 15, 16, 17 has to be replaced in order to retrofit the gas valve unit with another gas type.

Fig. 15 shows a variant of the switch arrangement according to fig. 1 to 3. The arrangement of the throttle section 5 with the throttle points 4 (4.1 to 4.5) corresponds exactly to the arrangement according to fig. 1 to 3. The arrangement of the gas inlet chamber 9 and the open/close valve 3 (3.1 to 3.5) also corresponds to the exemplary embodiment according to fig. 1 to 3. In contrast to the exemplary embodiments according to fig. 1 to 3, the gas inlet 1 is located on the right side of the gas inlet chamber 9 in the drawing. However, the position of the gas inlet 1 relative to the gas inlet chamber 9 and the gas flow direction inside the gas inlet chamber 9 are not very important for the function of the gas valve unit. In the throttle section 5, the gas flows in a direction from left to right, similar to the arrangement according to fig. 1 to 3. The throttle point 4.1 on the left in the drawing is therefore referred to as the first throttle point. The throttle point 4.5 on the right in the drawing is referred to as the last throttle point. According to this nomenclature, the open-close valve 3.1 on the left in the drawing is referred to below, and in the exemplary embodiment according to fig. 1 to 3, as the first open-close valve, and the open-close valve 3.5 on the right in the drawing is referred to as the last open-close valve.

In the switching position shown in fig. 15, the permanent magnet 8 is located to the right of the last open-close valve 3.5. The permanent magnet 8 thus does not exert a magnetic force on the open-close valve 3, so that none of the open-close valves 3.1 to 3.5 is open. This causes the valve unit to be completely closed and the connection between the gas inlet 1 and the gas outlet 2 to be completely blocked.

To open the gas valve unit from this switching position, the permanent magnet 8 is moved to the left into the region of the last open-close valve 3.5.

This switch position is shown in fig. 16, when the gas valve unit is maximally open. In this case, the gas flows directly from the gas inlet 1 via the last open/close valve 3.5 and the last throttle point 4.5 which are open to the gas outlet 2. The last throttle point 4.5 can have a large opening cross section, so that the gas flow is virtually unthrottled. In this case, the gas flows through the gas valve unit virtually without hindrance.

Since the permanent magnet 8 is moved to the left in the drawing, the gas flow can now be throttled in stages by means of the gas valve unit. Fig. 17 shows the intermediate position of the permanent magnet 8, in which it opens the two open-close valves 3.4 and 3.5. However, the gas volume flow to the gas outlet 2 is practically the same here as the gas volume flow according to the switching position of fig. 16.

In the switching position according to fig. 18, the permanent magnet merely opens the open-close valve 3.4. On the way to the gas outlet 2, the gas flow passes through both the throttle point 4.4 and the throttle point 4.5. The opening cross section of the throttle point 4.4 is smaller than the opening cross section of the throttle point 4.5, so that the gas flow is slightly throttled.

Fig. 19 shows the gas valve unit in the minimum open position, in which only the open-close valve 3.1 is open. On the way to the gas outlet 2, the gas flows through all throttle points 4.1 to 4.5. The throttle point 4 has an increasing cross section, as seen in the gas flow direction, in the throttle section 5. The resulting gas volume flow is thus determined primarily by the throttle point 4.1 with the smallest opening cross section. The flow resistance, which also influences the gas volume flow, caused by the remaining throttle points 4.2 to 4.5 is taken into account in the design of the open cross section.

In the case of the switch arrangements according to fig. 15 to 19, the gas valve unit is in the maximum open position immediately when it is actuated from its closed position. This has the positive effect that the gas-conducting lines and the gas burners downstream of the gas valve unit are filled with gas particularly rapidly. Furthermore, the gas burner can be ignited immediately after opening the gas valve unit when the gas volume flow is at a maximum, whereby the ignition process is easily carried out.

List of reference numerals

1 gas inlet

2 gas outlet

3 (3.1 to 3.5) open-close valve

4 (4.1 to 4.5) throttle point

5 throttle section

6 (6.1 to 6.4) connecting part

7 inlet part

8 permanent magnet

9 gas input chamber

10 blocking body

11 spring

12 valve sealing plate

12a opening

13 pressing plate

13a opening

14 first gas distribution plate

14a opening

15 throttle plate

16 second gas distribution plate

16a opening

17 cover plate

18 orifice

20 valve body

21 switching shaft

22 drive element

23 operating lever

24 holes

25 bolt

26 guide hole

27 cover member

Claims (18)

1. A gas valve unit for regulating the gas volume flow supplied to a gas burner of a gas appliance, wherein the gas valve unit has a valve body (20), in which valve body (20) at least two valve seats of an opening/closing valve (3) of the gas valve unit are formed, in which valve body (20) at least two throttle points (4) each having at least one throttle opening (18) are formed, wherein the valve body (20) has a plurality of plates (12, 13, 14, 15, 16, 17) which are arranged parallel to one another, wherein a valve sealing plate (12) forms a valve seat of the opening/closing valve (3), characterized in that the throttle openings (18) of the throttle points (4) are provided on a throttle plate (15) which consists of metal, wherein the throttle openings (18) of the throttle plate (15) have a precisely defined opening cross section.

2. A gas valve unit as claimed in claim 1, characterized in that the valve sealing plate (12) is made of a flexible material.

3. Gas valve unit according to claim 1 or 2, in which each open-close valve (3) has a blocking body (10) which rests against the valve sealing plate (12) when the open-close valve (3) is closed.

4. A gas valve unit as claimed in claim 3, characterized in that the valve sealing plate (12) has an opening (12 a) in the region of each valve seat, which opening is closed by a blocking body (10) resting on the valve sealing plate (12) when the open-close valve (3) is closed.

5. A gas valve unit as claimed in claim 3, characterized in that the blocking body (10) of the open-close valve (3) can be moved by means of the force of at least one permanent magnet (8).

6. A gas valve unit as claimed in claim 3, characterized in that each open-close valve has a spring (11) with which the blocking body (10) of the open-close valve (3) is prestressed against the valve sealing plate (12).

7. A gas valve unit as claimed in claim 3, characterized in that a pressure plate (13) is provided on the side of the valve sealing plate (12) facing away from the blocking body (10), which pressure plate consists of a substantially rigid material.

8. A gas valve unit as claimed in claim 7, characterized in that the pressure plate (13) has an opening (13 a) corresponding to the opening (12 a) in the valve sealing plate (12).

9. A gas valve unit as claimed in claim 7, characterized in that a first gas distribution plate (14) is arranged between the pressure plate (13) and the throttle plate (15), which first gas distribution plate has openings (14 a) corresponding to the openings (13 a) in the pressure plate (13) and to the throttle openings (18) in the throttle plate (15).

10. Gas valve unit according to claim 9, characterized in that at least a part of the openings (14 a) in the first gas distribution plate (14) respectively interconnect two adjacent chokes (18) of the chokes plate (15).

11. Gas valve unit according to claim 9, characterized in that a second gas distribution plate (16) is provided on the side of the throttle plate (15) facing away from the first gas distribution plate (14), which second gas distribution plate has openings (16 a) corresponding to the throttle openings (18) in the throttle plate (15).

12. Gas valve unit according to claim 11, characterized in that at least a part of the openings (16 a) in the second gas distribution plate (16) respectively interconnect two adjacent chokes (18) of the chokes plate (15).

13. Gas valve unit according to claim 11, in which the openings (16 a) of the second gas distribution plate (16) connect two adjacent chokes (18) of the chokes (15) which are not connected by the first gas distribution plate (14).

14. A gas valve unit as claimed in claim 9, characterized in that opening the open-close valve (3) corresponding to the respective opening (14 a) allows the opening (14 a) of the first gas distribution plate (14) to be connected substantially unthrottled with the gas inlet (1) of the gas valve unit.

15. A gas valve unit as claimed in claim 12, characterized in that the second gas distribution plate (16) has exactly one opening (16 a) to be connected to the gas outlet (2) of the gas valve unit.

16. The gas valve unit as recited in claim 1 wherein the gas appliance is a gas cooking appliance.

17. A gas valve unit as claimed in claim 2, characterized in that the valve sealing plate (12) consists of plastic.

18. A gas valve unit as claimed in claim 7, characterized in that the pressure plate (13) consists of metal.