Household appliance arrangement with a dosing device for adjusting and / or regulating a gas flow, and method for adjusting and / or regulating a gas flow

Description

[0001] The present invention is based on a household appliance arrangement comprising a household appliance and a dosing device for adjusting and / or regulating a gas flow. Furthermore, the present invention relates to a method for adjusting and / or regulating a gas flow using a dosing device.

[0002] Gas dosing systems are well known, for example, from US 2020 / 207603 A1. Such dosing devices are used to adjust a gas flow. For example, a gas flow rate can be set to a specific value using a pressure reducing valve (with or without an outlet pressure indicator), a throttle valve, a throttle orifice, or a solenoid valve. The current gas flow rate is typically not quantified.

[0003] Gas dosing devices are used, for example, as part of household appliances such as various food preparation machines.

[0004] A disadvantage of existing systems is that a gas flow rate cannot usually be adjusted variably yet precisely. For example, existing systems typically do not allow for a compact, cost-effective, and variably adjustable gas dosing system for relatively small gas flow rates. Disclosure of the invention

[0005] It is therefore an object of the present invention to provide a household appliance arrangement with an advantageous dosing device for

[0006] To provide adjustment and / or regulation of a gas flow, which in particular enables variable adjustment of the gas flow in a cost-effective manner and / or with increased user comfort.

[0007] The object of the present invention is achieved by a household appliance arrangement according to the features of claim 1.

[0008] The dosing device according to the invention has the advantage over the prior art that a compact and cost-effective gas dosing system can be provided with which a gas flow can be adjusted variably and precisely.

[0009] The dosing device according to the invention can be used advantageously for various gas media, which results in particularly flexible application possibilities.

[0010] According to the invention, the gas flow can be understood in particular as a gas mass flow and can comprise one or more gases.

[0011] According to the invention, it is advantageously possible that - in particular by electrically controlling the gas metering device - the gas flow rate can be specified and quantified within a certain setting range without the need for direct quantity measurement.

[0012] According to the invention, it is advantageously possible that no mechanical adjustment of a valve by a user is necessary to change the gas flow rate. A particular advantage is that, with the aid of the dosing device according to the invention, even a relatively small gas flow rate, in the range of 0 to 10 g / min, can be variably adjusted without mechanical actuation by a user. This makes the dosing device according to the invention particularly suitable for use in household appliances. Preferably, a gas flow rate in the range of 0 to 7 g / min can be adjusted with the aid of the dosing device according to the invention.

[0013] Due to the design of the dosing device according to the invention, it is particularly advantageous that pressure fluctuations at the inlet and / or outlet of the dosing device have no or only a slight influence on the gas flow, since they can be at least partially compensated.

[0014] It is conceivable that the gas flow can be adjusted continuously or in gradations, in particular precisely, using the metering device according to the invention.

[0015] According to the invention, it is conceivable that the dosing device comprises a control device and / or that an external control device is assigned to the dosing device. The control device comprises, in particular, electrical circuit means and / or computer means for controlling and / or adjusting the dosing device, in particular for controlling and / or adjusting the electrically controllable valve (e.g., a solenoid valve).

[0016] It is conceivable according to the invention that the gas passage opening is formed by means of a measuring orifice.

[0017] According to the present invention, the dosing device has a pressure sensor, wherein a gas pressure difference across a gas passage opening of the dosing device can be measured with the aid of the pressure sensor, wherein the electrically controllable valve can be adjusted depending on the measured gas pressure difference. This makes it possible to measure a current gas pressure difference in the dosing device and to draw conclusions about the current gas flow from the measured current gas pressure difference. The electrically controllable valve can then be controlled based on the determined current gas pressure difference and / or the current gas flow, so that a target value for the gas flow is established. According to one embodiment of the present invention, it is conceivable that the current gas flow is quantified by the dosing device, thereby enabling improved adjustment or control of the gas flow to a desired value.According to the present invention, it is thus advantageously possible to use the measurable gas pressure difference (or differential pressure) of the metering device to quantify the gas flow (or gas flow rate), in particular based on empirically determined data of the entire adjustment range of the electrically controllable valve and / or the control of the electrically controllable valve, as well as any tolerance-related performance deviations. The pressure sensor is, in particular, a differential pressure sensor, with the aid of which a difference in pressure on an inlet side of the gas passage opening and an outlet side of the gas passage opening can be measured.

[0018] According to the present invention, the metering device comprises an adjustable pressure control device, wherein a maximum gas pressure difference between an inlet area of ​​the metering device and an outlet area of ​​the metering device can be set using the adjustable pressure control device. The gas flow through the metering device, which can be set using the electrically controllable valve, is limited by the maximum gas pressure difference between the inlet area of ​​the metering device and the outlet area of ​​the metering device, which is set using the adjustable pressure control device. Thus, a constant or at least approximately constant maximum gas pressure difference can be set using the pressure control device (for example, using a diaphragm pressure regulator and / or a piston pressure regulator).This allows precise control of the gas flow using the electrically controllable valve even when devices with different, in particular changing and / or varying, pressures are connected to the ports (inlet and outlet) of the dosing device. According to the present invention, it is thus advantageously possible for a constant gas pressure difference (or a constant differential pressure) to be created in the dosing device using the pressure control device. It is possible to use the constant maximum gas pressure difference of the dosing device to quantify the gas flow (or the gas flow rate), in particular based on empirically determined data of the entire adjustment range of the electrically controllable valve and / or the control of the electrically controllable valve, as well as any tolerance-related performance deviations.With the aid of the adjustable pressure control device, it is particularly possible to design a diaphragm pressure regulator and / or a piston pressure regulator which is designed to set a constant or at least approximately constant maximum pressure difference between an inlet area of ​​the dosing device and an outlet area of ​​the dosing device.

[0019] According to the present invention, it is possible for the maximum differential pressure (or maximum gas pressure difference) between the inlet area and the outlet area of ​​the dosing device to be limited to a specific maximum value, according to the invention between 0.01 and 2.00 bar, preferably by the geometric properties of the dosing device, in particular with the aid of the adjustable pressure control device. The maximum value can be selected such that the maximum value corresponds to the maximum gas flow rate desired for a specific application. A particular advantage is that the gas flow rate can be precisely controlled even if the absolute gas pressure on the inlet and / or outlet side of the dosing device is not always at the same level or is not constant, i.e. there is no or at least no strong dependence on the existing pressure difference between the absolute pressure at the inlet and at the outlet.It is particularly advantageous in this case that, for the correct functioning of the dosing device, it is ensured that the absolute gas pressure at the inlet of the dosing device, in particular at a first gas connection of the dosing device, is higher than the absolute pressure on the outlet side of the dosing device, in particular at a second gas connection of the dosing device, by at least the maximum gas pressure difference set using the adjustable pressure control device.

[0020] Thus, a precise and advantageous adjustment of a gas flow can be carried out, wherein the dosing device can be designed in a particularly compact and cost-efficient manner and wherein, particularly advantageously, no mechanical adjustment of a valve by a user is necessary during operation of the dosing device.

[0021] Advantageous embodiments and further developments of the invention can be found in the dependent claims and the description with reference to the drawings. The statements relating to this subject matter of the present invention also apply to the other subject matters of the present invention, and vice versa.

[0022] According to one embodiment of the present invention, the adjustable pressure control device is configured using an adjustable diaphragm and / or an adjustable piston. Thus, a diaphragm pressure regulator and / or a piston pressure regulator are preferably configured. In particular, the pressure control device preferably comprises a diaphragm pressure reducer and / or a piston pressure reducer.

[0023] According to one embodiment of the present invention, it is provided that the adjustable pressure control device, in particular the adjustable diaphragm and / or the adjustable piston, is mechanically adjustable by means of an adjusting means, in particular such that the maximum gas pressure difference between the inlet region of the dosing device and the outlet region of the dosing device can be adjusted via the adjusting means. It is preferably conceivable that a pressure on the diaphragm and / or the piston can be adjusted by means of the adjusting means. It is preferably conceivable that the diaphragm and / or the piston can be deflected by means of the adjusting means. For example, it is conceivable that the diaphragm can be bent by means of the adjusting means.By means of the deflection of the diaphragm and / or the piston, the maximum gas pressure difference between the inlet area of ​​the dosing device and the outlet area of ​​the dosing device can be adjusted, thus limiting the maximum gas flow through the dosing device, in particular to a maximum value. According to a preferred embodiment of the present invention, it is conceivable for the adjusting means to comprise an adjusting screw, wherein the deflection of the diaphragm and / or the piston can be adjusted using the adjusting screw. The adjusting means is, in particular, part of the dosing device and / or can be connected to the dosing device.

[0024] According to one embodiment of the present invention, the electrically controllable valve is adjustable, in particular depending on the measured gas pressure difference, such that a target value for the gas pressure difference across the gas passage opening and / or a target value for the gas flow through the metering device, in particular through the gas passage opening, can be set. The electrically controllable valve is adjusted, in particular, depending on the gas pressure difference measured by the pressure sensor. The gas flow through the metering device is dependent, in particular, on the gas pressure difference across the gas passage opening.It is conceivable that the target value for the gas flow and / or the target value for the gas pressure difference can be provided, selected, and / or entered by a user using an input device of the dosing device or an input device of a device in communication with the dosing device. The setting and control of the electrically controllable valve is preferably carried out using the control device of the dosing device.

[0025] According to one embodiment of the present invention, it is provided that the gas flow through the dosing device can be determined and / or adjusted using reference data, wherein the reference data relates in particular to a relationship between the gas pressure difference across the gas passage opening and the gas flow through the dosing device. It is particularly advantageous for the control device of the dosing device to control the electrically adjustable valve (for example a solenoid valve) on the basis of the reference data in such a way that the target value for the gas flow through the dosing device is set. According to one embodiment of the present invention, it is particularly conceivable for the reference data to indicate a relationship between the gas pressure difference across the gas passage opening and the gas flow through the dosing device. The reference data relates in particular to a specific gas or gas mixture.depend on the specific gas or gas mixture.

[0026] It is advantageously possible to use a single metering device for different gas media, whereby the flow rate can be varied depending on the gas, particularly if a corresponding characteristic curve or corresponding characteristic curves for a specific gas medium are mapped and taken into account in the software of the control device. Thus, corresponding reference data for a specific gas or gas mixture are preferably stored in the control device or in a storage device that communicates with the control device.

[0027] According to one embodiment of the present invention, it is preferably provided that the electrically controllable valve comprises or is a solenoid valve. Precise control and regulation are possible with the aid of a solenoid valve. As an alternative or in addition to a solenoid valve, it is conceivable, for example, for the electrically controllable valve to have a motor drive.

[0028] According to one embodiment of the present invention, it is preferably provided that the electrically controllable valve, in particular the solenoid valve, can be controlled by means of a control device.

[0029] According to one embodiment of the present invention, it is provided that the solenoid valve has a 2 / 2-way valve which can be controlled by means of the control device with a, in particular fixed or variable, frequency and a variable duty cycle, in particular such that the gas flow through the metering device can be adjusted by means of a selection of the duty cycle, or wherein the solenoid valve has a 2 / 2-way proportional valve in which a variable opening cross-section at the valve seat of the solenoid valve can be adjusted by means of control by means of the control device, in particular such that the gas flow through the metering device can be adjusted by means of a selection of the opening cross-section at the valve seat.

[0030] It is particularly conceivable for the 2 / 2-way valve to be an opening and closing valve that can open and close the path of the working medium, i.e., in particular, the gas or gas mixture. According to one embodiment, the fact that the 2 / 2-way valve can be controlled by means of the control device with a frequency, in particular a fixed or variable frequency, and a variable duty cycle can preferably also be understood to mean that the 2 / 2-way valve can be controlled by means of the control device with a variable duty cycle, in particular such that the gas flow through the metering device can be adjusted by selecting the duty cycle.

[0031] For the 2 / 2-way proportional valve, it is preferably conceivable that the 2 / 2-way proportional valve comprises a variable and, in particular, adjustable opening cross-section. The opening cross-section can be changed by controlling the 2 / 2-way proportional valve via the control device. The resulting gas flow depends, in particular, on the set opening cross-section.

[0032] According to the present invention, the maximum gas pressure difference between the inlet area of ​​the metering device and the outlet area of ​​the metering device, which can be set using the adjustable pressure control device, corresponds to a definable maximum value between 0.01 bar and 2.00 bar. This allows for particularly advantageous applicability for comparatively low gas flow rates, such as those of interest in household appliances. Thus, a metering device with high precision and quality can be achieved for use in conjunction with comparatively low gas flow rates.

[0033] According to one embodiment of the present invention, the adjustable maximum gas pressure difference is determined as a function of a selectable maximum gas flow. The selectable maximum gas flow can, for example, depend on the specific application of the dosing device and can be adjusted using the diaphragm.

[0034] According to one embodiment of the present invention, the metering device comprises a check valve. The check valve is particularly designed to allow gas flow from an inlet of the metering device to an outlet of the metering device and to prevent an opposite gas flow from the outlet of the metering device to the inlet of the metering device. This allows for improved safety for a variety of applications.

[0035] A further subject of the present invention is a method according to claim 13 for adjusting and / or regulating a gas flow using a metering device according to an embodiment of the present invention, -- wherein the dosing device has a pressure sensor, wherein a gas pressure difference across a gas passage opening of the dosing device is measured by means of the pressure sensor, wherein the electrically controllable valve is adjusted as a function of the measured gas pressure difference; and -- wherein the dosing device comprises an adjustable pressure control device, wherein a maximum gas pressure difference between an inlet area of ​​the dosing device and an outlet area of ​​the dosing device is adjusted by means of the adjustable pressure control device, wherein the gas flow through the dosing device, which can be adjusted by means of the electrically controllable valve, is limited by the maximum gas pressure difference between the inlet area of ​​the dosing device and the outlet area of ​​the dosing device, which is adjusted by means of the adjustable pressure control device.

[0036] This allows for particularly efficient and flexible adjustment and / or control of a gas flow. Particularly advantageous is the precise adjustment and / or control of a gas flow even when there are fluctuations in the absolute pressure on the inlet side of the dosing device and / or fluctuations in the absolute pressure on the outlet side of the dosing device. Thus, precise adjustment and / or control of a gas flow is possible even when the gas pressure of the device connected to the inlet side of the dosing device (e.g., a gas cylinder, gas cartridge, or gas supply line) and / or the gas pressure of the device connected to the outlet side of the dosing device (e.g., a consumer device) fluctuates.This makes it possible to achieve advantageous adjustment and / or control of the gas flow even if the gas pressure difference between the devices connected to the inlet and outlet sides is not constant, for example if it changes or fluctuates over time.

[0037] According to one embodiment of the present invention, the gas flow is formed by a gas or a gas mixture, wherein reference data, in particular a curve of the gas flow as a function of the measured gas pressure difference across the gas passage opening, are determined for a given gas passage cross-section of the gas passage opening and for the gas or the gas mixture, wherein the electrically controllable valve is controlled and / or adjusted as a function of the reference data such that the resulting gas pressure difference across the gas passage opening corresponds to a selectable gas flow. According to one embodiment of the present invention, the resulting gas pressure difference across the gas passage opening can also be understood as an average gas pressure difference (for example, averaged over one or more cycles or periods of a 2 / 2-way valve).

[0038] Once the reference data or the curve have been determined, the electrically controlled valve (e.g. a solenoid valve) can be adjusted based on the reference data or curve for a desired or selectable gas flow so that the gas pressure difference results in the gas passage opening that corresponds to the desired or selectable gas flow.

[0039] The reference data can be determined in a preliminary phase using the dosing device. Alternatively, it is conceivable for the reference data to be determined using another dosing device. The additional dosing device is particularly preferably a device of the same or similar construction as the dosing device. The curve preferably corresponds to the ratio of gas differential pressure to gas flow rate.

[0040] It is conceivable that the reference data is determined, for example, in the pre-run phase using the dosing device or the further dosing device in such a way that (in particular for a specific gas or gas mixture) the gas flow is determined and / or ascertained as a function of the actuation of the electrically actuated valve, for example with the aid of an external testing and / or calibration device. On the basis of this reference data, a precise and advantageous adjustment of the gas flow can be carried out during operation of the dosing device by appropriately actuating the electrically actuated valve, in particular because the pressure control device can be used to ensure that an at least approximately constant maximum gas pressure difference exists between an inlet area of ​​the dosing device and an outlet area of ​​the dosing device during operation of the dosing device.In the event that the metering device comprises the pressure control device, it is therefore possible, according to a particularly preferred embodiment, to create a curve for a specific gas flow cross-section at the valve seat of the solenoid valve or at an orifice and a specific gas or gas mixture using empirical data. This curve corresponds to the ratio of the duty cycle (in the case of a 2 / 2-way valve) or the opening cross-section (in the case of a 2 / 2-way proportional valve) to the gas flow rate. Once this curve has been determined, the solenoid valve can be controlled to achieve a desired gas flow rate.

[0041] It is preferably conceivable that the gas flow (or gas mass flow) is approximately proportional to the measured gas pressure differential that occurs across the gas passage opening of the orifice plate. For a specific gas passage cross-section in the orifice plate and a specific gas, a curve can be created using empirical data that corresponds to the relationship between gas pressure differential and gas mass flow. Once this curve has been determined, the electrically controllable valve (e.g., a solenoid valve) can be controlled or regulated such that the (average) differential pressure corresponds to the desired gas mass flow.

[0042] According to one embodiment of the present invention, it is conceivable that the adjustable pressure control device, in particular with the aid of a testing and / or calibration device and in particular with the aid of the adjusting means, is adjusted, and in particular fixed, such that the adjustable maximum gas pressure difference between the inlet area and the outlet area is present when the electrically controllable valve is in a fully open position. Thus, an advantageous adjustment of the adjustable pressure control device (in particular the diaphragm and / or the piston) can be carried out, so that the adjustable pressure control device limits the gas flow during subsequent operation of the metering device independently of the current setting of the electrically controllable valve.

[0043] It is conceivable that the gas flow is formed by CO2 or comprises CO2. The use of CO2 is conceivable, for example, for a carbonation machine, particularly a beverage preparation machine. However, other gases or gas mixtures are also possible for other applications of the dosing device.

[0044] According to the present invention, it is provided that the selectable gas flow is selectable and / or adjustable, in particular by a user, in a range from 0 g / min to 10 g / min, particularly preferably 0 g / min to at least 7 g / min.

[0045] According to one embodiment of the present invention, the household appliance is a beverage preparation machine, wherein a beverage and / or a precursor substance for preparing a beverage can be mixed with a gas or gas mixture, in particular with CO 2 , using the dosing device, wherein the gas flow of the gas or gas mixture can be adjusted using the dosing device. The beverage preparation machine can in particular be a carbonation machine, a drinking water dispenser and / or carbonator, and / or a cold beverage machine. It is conceivable that a user can select a beverage with a specific CO 2 content via an input means, in particular an interface, of the beverage preparation machine, wherein the desired amount of CO 2 is added directly (in-line) to the water and / or the beverage substance and / or precursor substance via the dosing device during the beverage dispensing.

[0046] According to one embodiment of the present invention, it is provided that the household appliance is a gas grill, wherein a gas flow of the gas grill can be adjusted using the metering device. It is particularly conceivable for the gas grill to comprise an input means, in particular an interface, wherein the gas grill is set up in such a way that a user can set a target temperature, in particular a grilling temperature, via the input means of the gas grill. Preferably, a control device of the gas grill and / or the metering device regulates the gas flow through the metering device based on the current temperature in the grill (which can be measured, for example, via a temperature sensor of the gas grill). In particular, the control device regulates the gas flow through the metering device based on the current temperature in the grill in such a way that the gas flow through the metering device is regulated oris adjusted so that the target temperature is reached. The gas or gas flow in the gas grill is used primarily for heating or grilling food.

[0047] Further details, features, and advantages of the invention will become apparent from the drawings, as well as from the following description of preferred embodiments with reference to the drawings. The drawings merely illustrate exemplary embodiments of the invention, which do not restrict the essential inventive concept. Short description of the drawings

[0048] Figure 1 shows a schematic representation of a dosing device according to a first embodiment of the present invention. Figure 2 shows a schematic representation of a dosing device according to a second embodiment of the present invention. Figure 3shows a schematic representation of a dosing device according to a third embodiment of the present invention. Figure 4 shows a schematic representation of a dosing device according to a fourth embodiment of the present invention Figure 5 shows a schematic representation of a household appliance arrangement according to an embodiment of the present invention. Embodiments of the invention

[0049] In Figure 1 A schematic sectional view of a metering device 1 according to a first embodiment of the present invention is shown. The metering device 1 is provided for adjusting and / or regulating a gas flow 100. The gas flow 100 can be formed by a gas or a gas mixture, wherein the gas or gas mixture used can be different for different applications of the metering device 1. In the Figure 1the arrows 100 indicate the gas flow direction of the gas or gas mixture. The dosing device 1 comprises a first gas connection 31 on an inlet side of the dosing device 1 and a second gas connection 32 on an outlet side of the dosing device 1. With the help of the first gas connection 31, the dosing device 1 can be connected, for example, to a gas supply and / or a gas reservoir, such as a gas cartridge or bottle, for example via a gas line. Alternatively or additionally, it is conceivable that the gas supply can also reach the valve and / or the dosing device from a pressure reducer via a gas line. With the help of the second gas connection 32, the dosing device 1 can be connected, for example, to a household appliance which requires a gas or gas mixture to carry out a function of the appliance. With the help of the dosing device 1, the amount of gas supplied to such a device orThe gas flow rate provided to the device on the outlet side of the dosing device can be adjusted and regulated. Optionally, the dosing device 1 may have an inlet orifice 33 behind the first gas connection 31. To seal the transition between the first gas connection 31 and the housing 3 of the dosing device 1 (and preferably also to seal the transition between the inlet orifice 33 and the housing 3), a seal 40 is formed in the region of this transition. The housing 3 of the dosing device 1 may be formed in one or more parts.

[0050] The dosing device 1 comprises an electrically controllable valve 10', which in the illustrated embodiment is designed as a solenoid valve 10 with a valve stem 11. The gas flow through the dosing device 1 can be adjusted and / or regulated using the solenoid valve 10. According to a preferred embodiment, the solenoid valve 10 functions either as a 2 / 2-way valve, which is controlled by an electrical control with a fixed or variable frequency and a variable duty cycle, or as a 2 / 2-way proportional valve, in which the opening cross-section at the valve seat is variably adjusted via the electrical control. In both cases, the gas flow rate is determined and / or changed by controlling the solenoid valve 10.

[0051] A measuring orifice 34 with a gas passage opening 35 is arranged downstream of the solenoid valve 10 in the gas flow direction. The dosing device 1 further comprises a pressure sensor 20, which is designed to measure the gas pressure difference across the measuring orifice 34. A gas channel 21 leads from an area formed upstream of the measuring orifice 34 in the gas flow direction to the pressure sensor 20. Another gas channel 22 leads from an area formed downstream of the measuring orifice 34 in the gas flow direction to the pressure sensor 20. The pressure sensor 20 is thus designed as a differential pressure sensor and is configured to measure the gas pressure difference on both sides of the measuring orifice 34 (and thus across the gas passage opening 35). The gas flow through the dosing device 1 is at least approximately proportional to the measured differential pressure, which is established across the measuring orifice 34.For a specific gas passage cross-section of the gas passage opening 35 in the metering orifice 34 and a specific gas or gas mixture, a curve can be created using empirical data. This curve relates to and / or indicates a relationship between the gas pressure difference determined using the pressure sensor 20 and the gas flow rate. For example, the curve can indicate a ratio of the gas pressure difference to the gas flow rate. Once this curve has been determined, the solenoid valve 10 can be controlled and / or regulated such that the average gas pressure difference across the metering orifice 34, which can be determined and / or monitored using the pressure sensor 20 during operation of the metering device, corresponds to the desired gas flow rate.This allows for advantageous and precise adjustment and control of the gas flow without the need for mechanical interaction by a user, such as adjusting a screw or valve.

[0052] The pressure sensor 20 is covered on its upper side by means of a cover 52. Furthermore, part of the gas channel 21 is formed by means of the cover 52. The cover 52 is optionally fastened, preferably reversibly, to the housing 3 via connecting means 53, 54, in particular via screw connections 53', 54'. It is conceivable that the pressure sensor 20 can be exposed by removing the cover 52, in particular when the dosing device 1 is not in operation. To seal the transition between the cover 52 and the housing 3, a seal 41 is arranged in the region of this transition. The seal 41 is in particular also partially located on the upper side of the pressure sensor 20. A further seal 42 for sealing this transition is arranged on the underside of the pressure sensor 20, in particular at a transition between the pressure sensor 20 and the housing 3.An additional seal 43 is located at the transition between the housing 3 and the measuring orifice 34 to seal the transition between the measuring orifice 34 and the housing 3.

[0053] Furthermore, the dosing device 1 optionally includes a check valve 60, which is arranged upstream of the second gas connection 32, i.e., upstream of the outlet of the dosing device 1, and downstream of the metering orifice 34 in the gas flow direction. The check valve 60 advantageously restricts the gas flow to the intended direction from inlet to outlet, i.e., from the first gas connection 31 to the second gas connection 32, and suppresses an undesired opposite gas flow. A seal 44 is arranged at the transition between the check valve 60, the second gas connection 32, and the housing 3 to seal this transition.

[0054] In Figure 21 shows a schematic sectional view of a dosing device 1 according to a second exemplary embodiment of the present invention. The dosing device 1 is provided for adjusting and / or regulating a gas flow 100. The gas flow 100 can be formed by a gas or a gas mixture, whereby the gas or gas mixture used can be different for different applications of the dosing device 1. The arrows 100 symbolize the gas flow direction of the gas or gas mixture. The dosing device 1 comprises a first gas connection 31 on an inlet side of the dosing device 1 and a second gas connection 32 on an outlet side of the dosing device 1. Using the first gas connection 31, the dosing device 1 can be connected, for example, to a gas supply and / or a gas reservoir, such as a gas cartridge or bottle, for example via a gas line.Using the second gas connection 32, the dosing device 1 can be connected, for example, to a household appliance that requires a gas or gas mixture to perform a function of the appliance. Using the dosing device 1, the amount of gas supplied to such an appliance or the gas flow supplied to the appliance on the outlet side of the dosing device 1 can be adjusted and regulated. Optionally, the dosing device 1 comprises an inlet orifice plate 33 behind the first gas connection 31. To seal the transition between the first gas connection 31, the housing 3 of the dosing device 1, and the inlet orifice plate 33, a seal 40 is formed in the region of this transition. The housing 3 of the dosing device 1 can be formed in one piece or in multiple parts. The dosing device 1 has an adjustable pressure control device 2'.The pressure control device 2' is preferably designed as a piston pressure regulator and / or diaphragm pressure regulator (or with the aid of a piston pressure reducer and / or a diaphragm pressure reducer). In the embodiment shown, the pressure control device 2' has an adjustable diaphragm 2. The spaces on both sides of the diaphragm 2 are connected to one another via an orifice 12, in particular a differential pressure orifice, and by means of a connecting channel 8. The diaphragm 2 is connected to a valve 4, in particular a cone valve 4', wherein the valve 4 is adjustable by the diaphragm 2, in particular depending on a deflection and / or deflection of the diaphragm 2. For adjusting the diaphragm 2, an adjusting means 5, in particular an adjusting screw 5', is provided on the metering device 1. In particular, the diaphragm 2 and the adjusting means 5 are connected by means of a spring device.The pressure on the diaphragm 2 and thus in particular also the flow cross-section of the valve 4 can be adjusted using the adjusting means 5. The orifice plate 12 is installed in such a way that when gas flows, a differential pressure is created across the diaphragm 2, so that the valve 4 is adjusted. A maximum gas pressure difference between an inlet area of ​​the dosing device 1 and an outlet area of ​​the dosing device 1 can thus be adjusted and in particular fixed using the adjustable diaphragm 2 and the valve 4. With the help of the diaphragm 2, the gas flow through the dosing device 1 can thus be limited to a maximum value. An electrically controllable valve 10' is formed downstream of the diaphragm 2 in the gas flow direction, which valve comprises a solenoid valve 10 with a valve tappet 11.

[0055] The gas flow through the dosing device 1 is adjustable and / or regulated using the solenoid valve 10, whereby the gas flow adjustable using the solenoid valve 10 is limited by the maximum value set using the diaphragm 2. For this purpose, the diaphragm 2 is adjusted and fixed via the adjusting means 5, preferably on or using a testing and / or calibration device, so that a specific differential pressure exists between the inlet side and the outlet side when the solenoid valve 10 is fully open. According to a preferred embodiment, the solenoid valve 10 functions either as a 2 / 2-way valve, which is controlled using an electrical control with a fixed or variable frequency and a variable duty cycle, or as a 2 / 2-way proportional valve, in which the opening cross-section at the valve seat is variably adjusted using the electrical control.In both cases, the gas flow through the metering device 1 is determined and / or changed by controlling the solenoid valve 10. The gas flow is at least approximately proportional to the duty cycle of the 2 / 2-way valve or to the opening cross-section of the 2 / 2-way proportional valve. For a specific gas passage cross-section at the valve seat of the solenoid valve 10 (or at an orifice) and a specific gas or gas mixture, a curve is created, preferably using empirical data, particularly preferably with the aid of measurements. (i) - in the case of a 2 / 2-way valve - indicates a relationship between the duty cycle and the gas flow rate or (ii) - in the case of a 2 / 2-way proportional valve - indicates a relationship between the opening cross-section and the gas flow rate.

[0056] Particularly preferred is the curve (i) - in the case of a 2 / 2-way valve - the relationship between the duty cycle and the gas flow rate or (ii) - in the case of a 2 / 2-way proportional valve - the relationship between the opening cross-section and the gas flow rate.

[0057] In Figure 3 is a schematic sectional view of a dosing device 1 according to a third embodiment of the present invention. As in the second embodiment according to the Figure 2 In the third embodiment, an adjustable membrane 2 is provided, with the aid of which a maximum gas pressure difference between the inlet area of ​​the dosing device 1 and the outlet area of ​​the dosing device 1 can be set, so that the maximum gas flow through the dosing device 1 is limited. In contrast to the Figure 2In contrast to the second exemplary embodiment shown, no cone valve 4' is present in the third exemplary embodiment. The metering device 1 according to the third exemplary embodiment comprises an intermediate chamber 6, which is designed in particular adjacent to the membrane 2. As in the second exemplary embodiment, an adjusting means 5, in particular an adjusting screw 5', is designed on the metering device 1 for adjusting the membrane 2. The pressure on the membrane 2 can be adjusted via the adjusting means 5. The chamber of the membrane 2 has a passage 13 to the environment or atmosphere on the side of the membrane 2 facing away from the intermediate chamber 6. On the side of the membrane 2 facing away from the intermediate chamber 6, the air pressure and the pressure adjustable using the adjusting means thus act on the membrane 2. The membrane 2 is connected to a valve element 9, which can thus be adjusted via the membrane 2.The diaphragm 2 and the valve element 9 are arranged on opposite sides of a passage 9'. The diaphragm is used to adjust the valve element 9 so that a maximum gas pressure difference between an inlet area of ​​the dosing device 1 and an outlet area of ​​the dosing device 1 can be adjusted and, in particular, fixed. The diaphragm 2 and the valve element 9 thus regulate, in particular, an overpressure to the atmosphere or surroundings. With the aid of the diaphragm 2, the gas flow through the dosing device 1 can be limited to a maximum value. The gas flow through the dosing device 1 can be adjusted and / or regulated using the solenoid valve 10, whereby the gas flow adjustable using the solenoid valve 10 can be limited by adjusting the diaphragm 2.According to the second exemplary embodiment, the membrane 2 is adjusted and fixed via the adjusting means 5, preferably on or with the aid of a testing and / or calibration device, so that a specific differential pressure exists between the inlet side and the outlet side when the solenoid valve 10 is fully open. The solenoid valve 10 preferably functions either as a 2 / 2-way valve, which is controlled by an electrical control with a fixed or variable frequency and a variable duty cycle, or as a 2 / 2-way proportional valve, in which the opening cross-section at the valve seat is variably adjusted via the electrical control. In both cases, the gas flow rate through the metering device 1 is determined and / or changed by controlling the solenoid valve 10.

[0058] In contrast to the Figure 1In the first embodiment shown, the dosing device 1 according to the second and third embodiments does not have a pressure sensor 20.

[0059] However, according to further embodiments of the present invention, it is conceivable to provide a metering device 1 with both a membrane 2 (for example according to the Figures 2 and 3 ) and a pressure sensor 20 (for example according to the Figure 1 ) to train.

[0060] According to the first embodiment (cf. Figure 1 ) it is possible that the measurable differential pressure or the gas pressure difference across the gas passage opening 35, which can be determined using the pressure sensor 20, is used advantageously to quantify the gas flow rate, in particular on the basis of empirically determined data of the entire adjustment range of the solenoid valve 10 and / or the solenoid valve control as well as tolerance-related performance deviations.

[0061] According to the second and third embodiments (cf. Figures 2 and 3 ) it is possible for a constant or approximately constant maximum gas pressure difference to be created at the dosing device 1 using the membrane 2. This constant differential pressure is advantageously used to quantify the gas flow rate, in particular based on empirically determined data of the entire adjustment range of the solenoid valve 10 and / or the solenoid valve control, as well as tolerance-related performance deviations. The empirically determined data are, in particular, reference data, which are determined, for example, in a pre-run phase for the dosing device 1 and / or with the aid of additional dosing devices and / or with the aid of simulations.

[0062] In Figure 4A schematic sectional view of a dosing device 1 according to a fourth embodiment of the present invention is shown. The fourth embodiment corresponds to the third embodiment according to the Figure 3 , wherein additionally a differential pressure control is formed by means of a pressure sensor 20. The pressure sensor 20 or the differential pressure control can, for example, according to the first embodiment of the Figure 1 be trained.

[0063] With the aid of a dosing device 1 according to the invention, for example according to one of the preceding exemplary embodiments, a comparatively small gas flow rate in the range from 0 to 100 g / min, in particular in the range from 0 to 10 g / min, can be precisely adjusted continuously or with one or more increments by electrically controlling the electrically controllable valve 10', in particular the solenoid valve 10. It is particularly advantageous for the differential pressure between the gas connection on the inlet side and the gas connection on the outlet side to be limited to a specific maximum value, preferably between 0.01 bar and 2.00 bar, by the geometric properties of the dosing device 1 (in particular by means of the membrane 2), in particular depending on the maximum gas flow rate desired for a specific application.With the aid of a metering device 1 according to the invention, the advantage can be achieved that the gas flow can be precisely controlled even when the absolute gas pressure on the inlet and / or outlet side is not always at the same level or is not constant. This means, in particular, that there is no, or at least no strong, dependence on the existing absolute pressure difference. In this case, it is preferred that, for the proper functioning of the metering device 1, it is ensured that the absolute pressure at the inlet is at least the specified maximum gas pressure difference (preferably between 0.01 and 2.00 bar) higher than the absolute pressure on the outlet side.

[0064] According to the invention, a compact and cost-effective gas dosing system can thus be provided, with which a comparatively small gas flow rate, in particular in the range of 0 to 100 g / min, can be variably adjusted without mechanical actuation. This makes a dosing device 1 according to the invention particularly advantageous for use in household appliances 7.

[0065] Preferably, by electrically controlling the metering device 1, in particular the solenoid valve 10, the gas flow rate can be specified and quantified within a specific setting range without the need for direct quantity measurement.

[0066] The maximum differential pressure and the maximum gas flow rate can be limited to specific values, in particular by adjusting the geometric and mechanical properties of the dosing device and, in particular, by means of the membrane 2.

[0067] Particularly advantageously, according to the invention, no mechanical adjustment of a valve by a user is required to change the gas flow rate.

[0068] Advantageously, pressure fluctuations at the inlet and / or outlet of the dosing device have no or at most a slight influence on the gas flow, since such fluctuations can be completely or at least partially compensated.

[0069] A particular advantage of the present invention is that a single metering device 1 can be used for different gas media. The flow rate can be varied depending on the gas, provided the corresponding characteristics are mapped and taken into account in the control electronics software.

[0070] In Figure 5A schematic representation of a household appliance assembly according to an embodiment of the present invention is shown. The household appliance assembly comprises a household appliance 7 and a dosing device 1 according to an embodiment of the present invention.

[0071] The household appliance 7 can be, for example, a water dispenser or a cold beverage machine, wherein the dosing device 1 is used to dose a CO2 flow. A user can select a beverage with a specific CO2 content via an interface of the household appliance arrangement, wherein the desired amount of CO2 is added directly, and in particular in-line, to the water or cold beverage via the dosing device 1 during the beverage dispensing process.

[0072] Alternatively, the household appliance 7 can be, for example, a gas grill with a temperature control. A user can set a grill temperature via an interface of the household appliance arrangement, in particular the gas grill. A control or actuator regulates the gas flow via the dosing device 1 based on the current temperature in the grill.

[0073] Alternatively, other types and kinds of household appliances 7 are also conceivable, which can be used together with a dosing device 1 according to an embodiment of the present invention. List of reference symbols

[0074] 1 Metering device 2 Diaphragm 2 Pressure control device 3 Housing 4 Valve 4 Cone valve 5 Adjusting means 5 Adjusting screw 6 Intermediate chamber 7 Household appliance 8 Connecting channel 9 Valve element 9 Passage 10 Solenoid valve 10 Electrically controlled valve 11 Valve tappet 12 Orifice plate 13 Passage 20 Pressure sensor 21 Gas channel 22 Additional gas channel 31 First gas connection 32 Second gas connection 33 Inlet orifice plate 34 Metering orifice plate 35 Gas passage opening 40 Seal 41 Seal 42 Seal 43 Seal 44 Seal 45 Seal 52 Cover 53 Connecting means 53 Screw connection 54 Connecting means 54 Screw connection 60 Check valve 100 Gas flow

Claims

1. Domestic appliance assembly, comprising a domestic appliance (7) and a metering device (1) for adjusting and / or controlling a gas flow (100), wherein a mass flow of gas in the range of from 0 to 10 g / min can be adjusted by means of the metering device (1), wherein the metering device (1) comprises an electrically activatable valve (10'), wherein the gas flow (100) through the metering device (1) can be adjusted and / or controlled by means of the electrically activatable valve (10'), wherein the metering device (1) has a pressure sensor (20), and wherein the metering device (1) comprises an adjustable pressure control device (2'), characterized in that a gas pressure difference across a gas passage opening (35) of the metering device (1) can be measured by means of the pressure sensor (20), wherein the electrically activatable valve (10') can be adjusted in dependence on the measured gas pressure difference; wherein a maximum gas pressure difference between an inlet region of the metering device (1) and an outlet region of the metering device (1) can be adjusted by means of the adjustable pressure control device (2'), wherein the gas flow (100) through the metering device (1), which can be adjusted by means of the electrically activatable valve (10'), is limited by the maximum gas pressure difference between the inlet region of the metering device (1) and the outlet region of the metering device (1) that is adjusted by means of the adjustable pressure control device (2'), wherein the maximum gas pressure difference between the inlet region of the metering device (1) and the outlet region of the metering device (1) that can be adjusted by means of the adjustable pressure control device (2') corresponds to a specifiable maximum value between 0.01 bar inclusive and 2.00 bar inclusive.

2. Domestic appliance assembly according to Claim 1, wherein the adjustable pressure control device (2') is formed by means of an adjustable membrane (2) and / or by means of an adjustable piston.

3. Domestic appliance assembly according to one of the preceding claims, wherein the adjustable pressure control device, in particular the adjustable membrane (2) and / or the adjustable piston, is mechanically adjustable by means of an adjusting means (5), in particular in such a manner that the maximum gas pressure difference between the inlet region of the metering device (1) and the outlet region of the metering device (1) can be adjusted by means of the adjusting means (5).

4. Domestic appliance assembly according to one of the preceding claims, wherein the electrically activatable valve can be adjusted, in particular in dependence on the measured gas pressure difference, in such a manner that a target value for the gas pressure difference across the gas passage opening (35) and / or a target value for the gas flow (100) through the metering device (1), in particular through the gas passage opening (35), can be adjusted.

5. Domestic appliance assembly according to one of the preceding claims, wherein the gas flow (100) through the metering device (1) can be determined and / or adjusted by means of reference data, wherein the reference data relate in particular to a relationship between the gas pressure difference across the gas passage opening (35) and the gas flow (100) through the metering device (1).

6. Domestic appliance assembly according to one of the preceding claims, wherein the electrically activatable valve (10') comprises or is a solenoid valve (10).

7. Domestic appliance assembly according to one of the preceding claims, wherein the electrically activatable valve (10'), in particular the solenoid valve (10), can be activated by means of a control device.

8. Domestic appliance assembly according to Claim 7, wherein the solenoid valve (10) has a 2 / 2-way valve which can be activated by means of the control device with a frequency, in particular a fixed or variable frequency, and with a variable on-time, in particular in such a manner that the gas flow (100) through the metering device (1) can be adjusted by selecting the on-time, or wherein the solenoid valve (10) has a 2 / 2-way proportional valve, in which a variable opening cross section at the valve seat of the solenoid valve (10) can be adjusted by activation by means of the control device, in particular in such a manner that the gas flow (100) through the metering device (1) can be adjusted by selecting the opening cross section at the valve seat.

9. Domestic appliance assembly according to one of the preceding claims, wherein the maximum gas pressure difference which can be adjusted is determined in dependence on a selectable maximum gas flow (100).

10. Domestic appliance assembly according to one of the preceding claims, wherein the metering device (1) comprises a non-return valve (60).

11. Domestic appliance assembly according to one of the preceding claims, wherein the domestic appliance (7) is a drinks making machine, wherein a gas or gas mixture, in particular CO2, can be added by means of the metering device (1) to a drink and / or a preliminary substance for making a drink, wherein the gas flow (100) of the gas or gas mixture can be adjusted by means of the metering device (1).

12. Domestic appliance assembly according to one of the preceding claims, wherein the domestic appliance (7) is a gas grill, wherein a gas flow (100) of the gas grill can be adjusted by means of the metering device (1).

13. Method for adjusting and / or controlling a gas flow (100) by means of a metering device (1) of a domestic appliance assembly according to one of the preceding claims, wherein a mass flow of gas in the range of from 0 to 10 g / min can be adjusted by means of the metering device (1), wherein the metering device (1) has a pressure sensor (20), wherein a gas pressure difference across a gas passage opening (35) of the metering device (1) is measured by means of the pressure sensor (20), wherein the electrically activatable valve (10') is adjusted in dependence on the measured gas pressure difference; and wherein the metering device (1) comprises an adjustable pressure control device (2'), wherein a maximum gas pressure difference between an inlet region of the metering device (1) and an outlet region of the metering device (1) is adjusted by means of the adjustable pressure control device (2'), wherein the gas flow (100) through the metering device (1), which can be adjusted by means of the electrically activatable valve (10'), is limited by the maximum gas pressure difference between the inlet region of the metering device (1) and the outlet region of the metering device (1) that is adjusted by means of the adjustable pressure control device (2'), wherein the maximum gas pressure difference between the inlet region of the metering device (1) and the outlet region of the metering device (1) that can be adjusted by means of the adjustable pressure control device (2') corresponds to a specifiable maximum value between 0.01 bar inclusive and 2.00 bar inclusive.

14. Method according to Claim 13, wherein the gas flow (100) is formed by a gas or a gas mixture, wherein, for a given gas passage cross section of the gas passage opening (35) and for the gas or the gas mixture, reference data, in particular a profile curve of the gas flow (100) in dependence on the measured gas pressure difference across the gas passage opening (35), are determined, wherein the electrically activatable valve (10') is activated and / or adjusted in dependence on the reference data in such a manner that the gas pressure difference that is established across the gas passage opening (35) corresponds to a selectable gas flow.

15. Method according to either of Claims 13 and 14, wherein the adjustable pressure control device (2') is adjusted, and in particular fixed, in particular by means of a test and / or calibration apparatus and in particular by means of the adjusting means (5), in such a manner that, in the case of a fully open position of the electrically activatable valve (10'), the maximum gas pressure difference between the inlet region and the outlet region that can be adjusted is present.