Metering unit for a cleaning device, and cleaning device

Abstract

The invention relates to a metering unit (1) for a cleaning device, the metering unit comprising a receiving unit (1) for inserting a cartridge (2), which contains a detergent for a cleaning process of the cleaning device, into the receiving unit and for removing the cartridge (2) from the receiving unit (11). The metering unit (1) also comprises an identification device (12) for identifying whether the cartridge (2) is inserted into the receiving unit (11) or is removed from the receiving unit (11) and also for identifying a level of a cleaning fluid, which contains the detergent, in the receiving unit (11). The identification device (12) comprises a first identification unit (121) and a second identification unit (122). The second identification unit (122) can assume an operating position, an empty position and an overflow position, relative to the receiving unit (11). The metering unit (1) is configured such that: when the cartridge (2) is removed from the receiving unit (11), the second identification unit (122) is located in the empty position; when the cartridge (2) is inserted into the receiving unit (11) and the level is below a first threshold value, the second identification unit (122) is located in the operating position; and when the cartridge (2) is inserted into the receiving unit (11) and the level is above a second threshold value, which is greater than or equal to the first threshold value, the second identification unit (122) is located in the overflow position.

Description

[0001] DOSING UNIT FOR A CLEANING DEVICE AND CLEANING DEVICE

[0002] DESCRIPTION

[0003] The present invention relates to a dosing unit for a cleaning device and to a cleaning device.

[0004] In conventional solid dosing, solid detergent from a cartridge is used to dispense the detergent into a dishwasher. For this purpose, the cartridge (filled with solid detergent) is placed from above into a funnel-like holder. The device is equipped with a fresh water connection which directs the incoming water to a nozzle within the device. The incoming water, together with the geometry of the nozzle, forms a spray jet which is directed towards the opening of the inserted and filled cartridge. As a result, the spray jet strikes the solid detergent within the cartridge and partially dissolves it. The resulting detergent solution flows by gravity out of the same opening in the cartridge and is collected in a dispensing hose through a funnel-like construction within the device.The resulting detergent-water mixture is then fed into the dishwasher's cleaning chamber via a steady gradient for dosing into the machine.

[0005] Cartridge detection can ensure that dosing, and therefore water flow, only occurs when a cartridge is inserted into the funnel. Conventionally, this can be achieved using a non-return valve in the funnel inlet, which is opened when the cartridge is inserted, or an electronic switch to control the inlet, which is activated when the cartridge is inserted. Over-level detection can also ensure that dosing only occurs when the detergent-water mixture can drain away, thus preventing the funnel-like holding device from overflowing in the event of a fault. Conventionally, this can be achieved using a second drain through which the detergent-water mixture can drain if the first drain is blocked, or a sensor to detect an over-level.

[0006] US 2005 / 0023290 Ai, for example, describes a detergent dispenser which contains a safety cut-off mechanism for the assembly and dismounting of a container (“container mounting and dismounting safety cut-off mechanism 25”) and an overflow preventive sensor 26. The safety cut-off mechanism is implemented by a spring-loaded plunger and registers the placement of a container by pressing the spring-loaded plunger downwards, thereby establishing contact with a solenoid valve. The overflow prevention mechanism, on the other hand, is implemented by two electrodes and registers an overflow of the detergent solution when a current flows between the two electrodes; as a result, the solenoid valve in the inlet is closed and a signal is output. The safety cut-off mechanism and the overflow prevention mechanism are therefore made up of different components.Components are realized that are designed separately from each other (see Figures 5 and 6 of Di).

[0007] Because the cartridge detection and over-level detection in such a conventional dosing unit or cleaning device are implemented by different and separately designed components, the conventional dosing unit or cleaning device has a larger size and a more complex structure, resulting in greater effort and higher costs for their production. Furthermore, the cartridge detection and over-level detection must each output separate signals to the dosing unit or cleaning device. This reduces the efficiency of the dosing unit or cleaning device. Finally, these different components complicate the maintenance and repair of the dosing unit or cleaning device.

[0008] It is therefore an object of the present invention to improve a dosing unit or cleaning device with regard to efficiency, manufacturing costs and user-friendliness, taking into account the desired applications.

[0009] This object is achieved by a dosing unit according to claim 1, a dosing system according to claim 18, and a cleaning device according to claim 19. Claims 2 to 17 relate to particularly advantageous implementations of the dosing unit according to claim 1.

[0010] According to the present invention, a dosing unit for a cleaning device comprises a receiving unit for inserting a cartridge containing a cleaning agent for a cleaning process of the cleaning device into the receiving unit and for removing the cartridge from the receiving unit. The dosing unit further comprises a detection device for detecting both whether the cartridge is inserted into the receiving unit or removed from the receiving unit and for detecting a level of a cleaning liquid containing the cleaning agent in the receiving unit. The cleaning device can be, for example, a dishwasher, in particular a commercial dishwasher, a dishwasher for other items to be washed, such as medical devices, or a washing machine.

[0011] The dosing unit can be a component of the cleaning device and / or integrated into the cleaning device. Alternatively, the dosing unit can be formed separately from the cleaning device and / or serve as an external component for the cleaning device.

[0012] The dosing unit may comprise a drain, in particular a drain opening, through which the cleaning fluid can drain from the receiving unit, e.g., into a dosing hose of the cleaning device to be used for a cleaning process. The receiving unit may, in particular, be funnel-shaped or have a funnel-shaped section, so that the cleaning fluid can be collected in the receiving unit and flow toward the drain.

[0013] The cleaning agent can be a solid cleaner or contain a solid cleaner, and the cleaning liquid can be a solution of the solid cleaner. Alternatively, the cleaning agent can be a liquid and / or viscous cleaning concentrate, and the cleaning liquid can be a diluted solution of the cleaning concentrate. The dosing unit can comprise a spray unit for spraying fresh water into the cartridge, so that the cleaning liquid is formed by dissolving the cleaning agent contained in the cartridge in the fresh water and then flows from the cartridge into the receiving unit. Furthermore, the dosing unit can comprise an inlet, in particular an inlet opening, through which the fresh water can flow into the dosing unit and be guided to the spray unit.After passing through the spray unit, the fresh water can form a spray jet, which can be directed toward an opening in the inserted cartridge. This spray jet can hit the cleaning agent in the cartridge and at least partially dissolve it to form the cleaning liquid, which then drains from the cartridge into the receiving unit. A sieve can be located in the cartridge opening, which, through gravity, allows the solid cleaner to trickle down to the lowest point in the cartridge. In this case, the trickling of the powder serves as a replenishment for the dissolved solid cleaner from the cartridge.

[0014] Alternatively, the cleaning agent in the cartridge can be liquid, and the cleaning fluid in the receptacle can be identical to the cleaning agent drained from the cartridge. In this case, the drainage of the cleaning agent from the cartridge can be controlled, for example, by a valve in or on the cartridge opening.

[0015] The fresh water can flow from an external fresh water connection directly via the inlet of the dosing unit to the spray unit, for example using a water safety device, e.g. type AD, DB or DC. In this case, the water pressure required for spraying the fresh water can be generated by the mains pressure. Alternatively, the fresh water can first flow from the external fresh water connection into an intermediate tank, which can be located in or on the cleaning device, and from the intermediate tank further via the inlet to the spray unit, e.g. using a water safety device type AB. In this case, the water pressure required for spraying the fresh water can be generated, for example, by a pressure booster pump between the intermediate tank and the dosing unit.

[0016] According to the present invention, the dosing unit further comprises a detection device for detecting both whether the cartridge is inserted into the receiving unit or removed from the receiving unit and for detecting a level of the cleaning liquid in the receiving unit.

[0017] When a cartridge is inserted into the receiving unit, in a normal state of the dosing device the cleaning liquid can flow out of the drain, as described above. In contrast, in a fault state, for example if the drain is blocked, the cleaning liquid may not flow out of the drain or may not flow out completely. Consequently, the level of cleaning liquid in the receiving unit may be lower in the normal state than in the fault state. In particular, the level of cleaning liquid in the normal state may be below a first threshold (i.e. no overlevel present) and above a second threshold (i.e. overlevel present) in the fault state, wherein the second threshold is greater than or equal to the first threshold. Thus, by detecting the level of cleaning liquid, the detection device can determine the normal state or the fault state of the dosing unit.

[0018] The detection device further comprises a first detection unit and a second detection unit. The first detection unit is arranged to be movable back and forth between a first position and a second position relative to the receiving unit or one or more parts of the receiving unit, in particular relative to a housing of the receiving unit. Preferably, the first detection unit is fastened to the receiving unit and arranged to be rotatable relative to the receiving unit between the first position and the second position, as described in more detail below. The first detection unit and the second detection unit are coupled or connected to one another or fastened to one another in such a way that relative movement between the first detection unit and the second detection unit is possible at least in a specific position of the first detection unit.The first and second detection units can, in particular, be attached to one another in such a way that they are movable relative to one another but cannot be separated from one another. Preferably, the second detection unit is arranged rotatably relative to the first detection unit, as described in more detail below. The specific position of the first detection unit is preferably the second position, but can also be another position, in particular an intermediate position between the first position and the second position.

[0019] The dosing unit is designed such that the second detection unit can assume an operating position, an empty position, and an overflow position. In particular, the second detection unit can be moved back and forth between these three positions by the movement of the first detection unit relative to the receiving unit and / or by the movement of the second detection unit relative to the first detection unit.

[0020] When the cartridge is removed from the receiving unit, i.e., when no cartridge is present in the receiving unit, the second detection unit is arranged in the empty position. Preferably, in this case, the first detection unit is arranged in the first position. When the cartridge is inserted into the receiving unit and the level of the cleaning fluid is below the first threshold, the second detection unit is arranged in the operating position, and when the cartridge is inserted into the receiving unit and the level is above the second threshold, the second detection unit is arranged in the overflow position.Preferably, when the cartridge is inserted into the receiving unit, the first detection unit is arranged in the second position, and particularly preferably in this case, due to the relative mobility of the second detection unit to the first detection unit, the second detection unit is arranged to be movable between the operating position and the overflow position.

[0021] The detection device thus serves both to detect whether the cartridge is inserted into the receiving unit or removed from the receiving unit (cartridge detection) and to detect the level of the cleaning liquid in the receiving unit (over-level detection), so that the number of components or parts of the dosing unit according to the invention is reduced compared to conventional dosing units. As a result, the dosing unit according to the invention can be smaller and more compact and have a simpler structure than conventional dosing units. Furthermore, the dosing unit according to the invention can be manufactured with less effort and at lower cost. In addition, the control of the dosing of the cleaning agent is also simplified because the number of signals required from the detection device is reduced, as described in more detail below. The efficiency of the dosing unit is thus also increased.of the cleaning device. Finally, the maintenance and repair of the dosing unit or cleaning device is simplified due to the smaller number of components. In summary, the dosing unit according to the invention is improved over a conventional dosing unit in terms of efficiency, manufacturing costs, and user-friendliness.

[0022] In a preferred embodiment, the dosing unit further comprises a controller configured to control dosing of the cleaning agent from the cartridge based on the position of the second detection unit. In particular, the controller can be configured to enable dosing of the cleaning agent from the cartridge when the second detection unit is arranged in the operating position and to prevent dosing of the cleaning agent from the cartridge when the second detection unit is arranged in the empty position and / or the overflow position. Specifically, the controller can be configured to enable spraying of fresh water from the spray unit into the cartridge when the detection unit is arranged in the operating position and to prevent spraying of fresh water when the second detection unit is arranged in one of the empty position and the overflow position.For example, the controller can enable the spraying of fresh water by opening a solenoid valve in the water inlet and prevent the spraying of fresh water by closing the solenoid valve in the water inlet. Alternatively, if the cleaning agent in the cartridge is liquid, the controller can be configured to allow the liquid cleaning agent to drain from the cartridge, for example, by opening a valve in or on the cartridge opening when the detection unit is arranged in the operating position, and prevent the cleaning agent from draining from the cartridge, for example, by closing the valve when the detection unit is arranged in one of the empty position and the overflow position.

[0023] This control ensures that dosing of the cleaning agent, in particular spraying fresh water into the cartridge and / or draining of the cleaning agent or cleaning solution from the cartridge into the receiving unit, only occurs when the cartridge is inserted into the receiving unit and there is no excess level of cleaning fluid in the receiving unit. This ensures correct and efficient dosing of the cleaning agent, prevents overflow of the cleaning fluid, e.g., if the drain is blocked, and prevents damage to the dosing unit, the cleaning device, or the items being cleaned in the cleaning device due to incorrect dosing.

[0024] In a further preferred embodiment, the dosing unit comprises a sensor configured to detect a position of the second detection unit relative to the receiving unit and to output a first detection signal based on the detected position. Preferably, the controller is configured to control the dosing of the cleaning agent from the cartridge based on the first detection signal.

[0025] Particularly preferably, the sensor only distinguishes between the operating position, on the one hand, and the empty position or the overflow position, on the other. For example, the first detection signal can be an operation detection signal when the second detection unit is arranged in the operating position, and an error detection signal that differs from the operation detection signal when the second detection unit is arranged in one of the empty position and the overflow position. In this case, the controller can enable or prevent the dosing of the cleaning agent from the cartridge when it receives the operation detection signal or the error detection signal, respectively. Alternatively, the sensor can output a first detection signal when the second detection unit is arranged in the operating position, and not output a first detection signal when the second detection unit is arranged in one of the empty position and the overflow position.In this case, the controller can enable the dosing of the cleaning agent from the cartridge when it receives a first detection signal and prevent the dosing of the cleaning agent when it does not receive a first detection signal. Consequently, only a single sensor and a single detection signal are required to achieve efficient control of the cleaning agent dosing. This simplifies the design of the dosing unit, reduces the number of components and manufacturing costs, and increases the efficiency of the dosing unit.

[0026] The sensor preferably comprises a first magnetic switch, e.g., a first reed contact, and a magnet. The first magnetic switch can be attached to the receiving unit, in particular to a housing or a part of the receiving unit that is immovable relative to the housing, such that the first magnetic switch is immovable relative to the receiving unit or one or more parts of the receiving unit, while the magnet can be attached to the second detection unit. Conversely, the magnet can also be attached to the receiving unit and the first magnetic switch to the second detection unit. Since the second detection unit can assume different positions relative to the receiving unit, the magnet can assume different positions relative to the first magnetic switch.In particular, the distance of the magnet from the first magnetic switch may be smaller when the second detection unit is in the operating position than when the second detection unit is in the empty position or the overflow position.

[0027] The sensor can detect the position of the second detection unit based on a relative arrangement of the magnet to the first magnetic switch, in particular based on the distance of the magnet from the first magnetic switch. For example, the sensor can only output a first detection signal when the distance between the magnet and the first magnetic switch falls below a predetermined minimum distance, so that the sensor outputs the first detection signal when the second detection unit is in the operating position, but does not output it when the second detection unit is in the empty or overflow position. Thus, the following two switching states can be distinguished based on the relative position of the magnet to the first magnetic switch: 1. Dosing possible (cartridge inserted and no overlevel present), 2. Dosing not possible (cartridge not inserted and / or overlevel present).

[0028] Alternatively, the sensor can distinguish between each of the operating position, the empty position, and the overflow position. In particular, the sensor can comprise a second magnetic switch, e.g., a second reed switch, wherein the first and second magnetic switches can be attached to different locations on the receiving unit. The sensor can detect the position of the second detection unit based on an arrangement of the magnet relative to the first magnetic switch and the second magnetic switch, in particular based on a distance of the magnet from the first magnetic switch and a distance of the magnet from the second magnetic switch.

[0029] For example, as described above, the distance of the magnet from the first magnetic switch may be smaller when the second detection unit is in the operating position than when the second detection unit is in the idle position or the overrun position, and accordingly, the first magnetic switch may only output a first detection signal when the second detection unit is arranged in the operating position. Furthermore, the distance of the magnet from the second magnetic switch may be smaller when the second detection unit is in the overrun position (or alternatively, the idle position) than when the second detection unit is in the operating position or the idle position (or alternatively, the overrun position), and accordingly, the second magnetic switch may only output a second detection signal when the second detection unit is arranged in the overrun position (or alternatively, the idle position).By combining the first and second detection signals, the position of the detection unit can be determined: If the first detection signal is output and the second detection signal is not output, the second detection unit is in the operating position. If the first detection signal is not output and the second detection signal is output, the second detection unit is in the overflow position (or alternatively, the empty position). If neither the first detection signal nor the second detection signal is output, the second detection unit is in the empty position (or alternatively, the overflow position).

[0030] The controller can further be configured to issue an empty warning signal when the detection unit is in the empty position and / or an overflow warning signal when the detection unit is in the overflow position. The user can thus determine the type of error based on the issued warning signal, e.g., whether no cartridge is inserted or an overflow level is present, and take appropriate action to correct the error. This further increases the functionality and user-friendliness of the dosing unit.

[0031] In a preferred embodiment, the dosing unit comprises a spring element configured such that, when no cartridge is inserted, the first detection unit is biased in the first position, and, when the cartridge is inserted into the receiving unit, the first detection unit is moved from the first position to the second position against the spring force of the spring element. Preferably, the second detection unit is connected to the first detection unit such that, when the level of the cleaning fluid is below the first threshold and the cartridge is inserted into the receiving unit, the first detection unit is moved from the first position to the second position against the spring force of the spring element, thereby moving the second detection unit from the empty position to the operating position.This enables efficient positioning of the first and second detection units depending on whether a cartridge is inserted or not, and thus efficient and accurate cartridge detection by the detection device.

[0032] In a preferred embodiment, the dosing unit is designed such that, when the cartridge is inserted into the receiving unit and the level of the cleaning fluid rises from the first threshold to the second threshold, a buoyancy force of the cleaning fluid acts on the second detection unit, so that the second detection unit is moved from the operating position to the overflow position. Particularly preferably, the dosing unit is designed such that, when the level of the cleaning fluid is above the first threshold, the second detection unit floats at least partially on the cleaning fluid. For example, the second detection unit can comprise a cavity in which a buoyancy element is arranged, wherein the buoyancy element is preferably an air cushion. The buoyancy element can have a lower density or average density than the cleaning fluid, in particular a density less than 1 g / cm3 This has the advantage that the second detection unit can be manufactured by a simple injection-molding process, and a buoyancy element can then be inserted into the cavity of the second detection unit. In particular, the second detection unit can then be made of the same material as the first detection unit, thereby reducing manufacturing costs. Alternatively, the second detection unit itself can be made of a material that has a lower density than the cleaning fluid, in particular a density less than 1 g / cm 3 In this case, the second detection unit can be manufactured, for example, by thermoplastic foam injection molding.

[0033] In a preferred embodiment, the first detection unit is attached to the receiving unit by means of a first pivot joint, in particular to the housing or a part of the receiving unit that is immovable relative to the housing, so that the first detection unit is arranged to be rotatable relative to the receiving unit between the first and the second position. In particular, the dosing unit can be designed such that, when the level is below the first threshold and the cartridge is inserted into the receiving unit, the first detection unit is rotated relative to the housing about the first pivot joint, thereby moving the second detection unit from the empty position to the operating position.

[0034] Furthermore, the second detection unit is particularly preferably fastened to the first detection unit by means of a second rotary joint, so that at least in the specific position of the first detection unit, the second detection unit is arranged to be rotatable relative to the first detection unit. In particular, the dosing unit can be designed such that, when the level is below the first threshold value and the cartridge is inserted into the receiving unit, the first detection unit is rotated relative to the housing about the first rotary joint and, as a result, the second detection unit is rotated relative to the first detection unit about the second rotary joint and is moved from the empty position to the operating position. The first rotary joint and the second rotary joint as described above each have the advantage that the risk of tensioning of the respective two joint partners (iethe receiving unit and the first detection unit in the case of the first rotary joint, or the first detection unit and the second detection unit in the case of the second rotary joint). This prevents damage to the dosing unit and further improves the efficiency and user-friendliness of the dosing unit.

[0035] Alternatively, the first detection unit may be arranged to be linearly movable between the first and the second position and / or the second detection unit may be arranged to be linearly movable relative to the first detection unit.

[0036] In a preferred embodiment, the receiving unit comprises a side wall arranged parallel to an insertion direction of the cartridge, in particular along a circumferential direction of the cartridge, wherein the detection device is arranged partially or completely in a recess of the side wall, at least when the cartridge is inserted into the receiving unit. This enables a particularly compact arrangement of the dosing unit, thereby further reducing the size of the dosing unit and the manufacturing costs. Preferably, the insertion direction of the cartridge runs parallel or substantially parallel to the direction of the earth's gravity while the dosing unit or cleaning device is in operation. The arrangement of the detection device in the recess of the side wall enables, in particular, the detection device to precisely detect whether a cartridge is inserted into the receiving unit or not, regardless of the cartridge weight.This is particularly advantageous because when the dosing unit is used, the cleaning agent is flushed out of the cartridge, reducing the cartridge's weight. This avoids the increased effort required to design the reset mechanism or adjust the spring force of the spring element. Alternatively, the detection device can also be located underneath the cartridge.

[0037] Preferably, the second detection unit is arranged to be linearly movable between the operating position and the empty position along a direction of movement. In particular, when the level of the cleaning fluid is below the first threshold, the second detection unit can rest at least partially on a support surface of the dosing unit and slide along the support surface between the operating position and the empty position. The direction of movement of the second detection unit preferably differs from an insertion direction of the cartridge, wherein the angle between the direction of movement and the insertion direction is preferably not equal to 0° and particularly preferably 90° or substantially 90°.In particular, the dosing unit can be configured such that, when the level is below the first threshold and the cartridge is inserted into the receiving unit, the first detection unit is rotated relative to the receiving unit about the first pivot joint, thereby rotating the second detection unit relative to the first detection unit about the second pivot joint and moving linearly from the empty position to the operating position along the direction of movement. This enables precise detection of whether or not a cartridge is inserted into the receiving unit, particularly regardless of the cartridge weight.

[0038] Furthermore, the first detection unit can comprise a contact surface, wherein, when the level is below the first threshold and the cartridge is removed from the receiving unit, the contact surface is arranged at an angle other than 0° to a direction of insertion of the cartridge. When the cartridge is inserted into the receiving unit, the cartridge first comes into contact with the contact surface and exerts a force on the contact surface, so that the first detection unit is rotated about the first pivot joint relative to the receiving unit against the spring force of the spring element and is thereby moved from the empty position to the operating position. This enables particularly simple insertion of the cartridge into the receiving unit. When the cartridge is inserted, the contact surface can be arranged at an angle of 0° or substantially 0° to the direction of insertion of the cartridge and / or be flush or substantially flush with the side wall.In particular, the contact surface can then rest against the cartridge and / or be preloaded toward the cartridge by the spring force of the spring element. This enables the cartridge to be held particularly securely in the receiving unit during operation of the dosing unit or cleaning device.

[0039] According to the present invention, a dosing system comprises a dosing unit as described above and the cartridge. In particular, the shape and size of the receiving unit can be adapted to the shape and size of the cartridge, respectively, so that the cartridge fits precisely into the receiving unit and is held stably during operation of the dosing unit. As described above for the dosing unit according to the invention, the dosing system according to the invention also enables high efficiency and user-friendliness as well as low manufacturing costs. According to the present invention, a cleaning device comprises a dosing unit as described above. As described above for the dosing unit according to the invention, the cleaning device according to the invention also enables high efficiency and user-friendliness as well as low manufacturing costs.

[0040] These and other features and advantages of the invention will become clear from the accompanying drawings, which show a particularly advantageous embodiment. They show:

[0041] Fig. i is a cross-sectional view of an embodiment of the invention

[0042] Dosing unit in which no cartridge is inserted;

[0043] Fig. 2 is a cross-sectional view of the embodiment of the invention

[0044] Dosing unit into which a cartridge is inserted, whereby there is no excess level of cleaning liquid;

[0045] Fig. 3 is a cross-sectional view of the embodiment of the dosing unit according to the invention, into which a cartridge is inserted, wherein an excess level of the cleaning liquid is present;

[0046] Fig. 4A is a schematic view of a cleaning device with an integrated dosing unit; and

[0047] Fig. 4B is a schematic view of a cleaning device with an external dosing unit.

[0048] Figs. 1 to 3 each show a cross-sectional view of a dosing unit 1 according to the invention for a cleaning device. The vertical direction, i.e., the direction from top to bottom, in these figures corresponds to the direction of insertion of a cartridge 2 into the dosing unit 1 and coincides with the direction of the earth's gravity when the dosing unit 1 or the cleaning device is in operation.

[0049] The dosing unit 1 comprises a receiving unit 11, a detection device 12, a first rotary joint 13, a sensor 14, a spring element 15, a spray unit 16, an inlet 17 and an outlet 18. The receiving unit 11 is funnel-shaped and tapers in the vertical direction from top to bottom. The inlet 17 can be connected to a fresh water connection 5 through which fresh water flows into the dosing unit 1. As shown in Fig. 2 with arrows, the fresh water, after passing through the spray unit 16, forms a spray jet which is directed towards an opening of the inserted cartridge 2, so that the spray jet hits the cleaning agent, e.g. the solid cleaner, in the cartridge and partially dissolves it. The resulting cleaning liquid, iethe solution of the cleaning agent in the fresh water, runs out of the cartridge into the funnel-shaped receiving unit 11, is collected there and runs out of the dosing unit via the outlet 18, e.g. into a dosing hose, in order to be used for a cleaning process of the cleaning device.

[0050] The detection device 12 comprises a first detection unit 121, which is attached to a housing of the receiving unit 11 by means of a first pivot joint 13. As a result, the first detection unit 121 is arranged so as to be rotatable relative to the receiving unit 11 between a first and a second position. In Fig. 1, the first detection unit 121 is arranged in the first position, while in Figs. 2 and 3 it is arranged in the second position.

[0051] The detection device 12 further comprises a second detection unit 122, which is fastened to the first detection unit 121 by means of a second pivot joint 123, such that, as shown in Figs. 2 and 3, at least in the second position of the first detection unit 121, the second detection unit 122 is arranged rotatably relative to the first detection unit 121. Due to the rotatable arrangement of the first detection unit 121 relative to the receiving unit 11 and the rotatable arrangement of the second detection unit 122 relative to the first detection unit 121, the second detection unit 122 can assume three positions relative to the receiving unit 11: the empty position as shown in Fig. 1, the operating position as shown in Fig. 2, and the overflow position as shown in Fig. 3.

[0052] In Fig. 1, no cartridge 2 is inserted into the receiving unit 11. In this case, the first detection unit 121 is biased by the spring element 15 in the first position, while the second detection unit 122 rests at least partially on a support surface 112 and is therefore in the empty position.

[0053] When, as shown in Fig. 2, a cartridge 2 is inserted into the receiving unit 11, the first detection unit 121 is rotated about the first pivot 13 against the spring force of the spring element 15 and thereby moved from the first position (Fig. 1) to the second position (Fig. 2). As a result, the second detection unit 122 is rotated relative to the first detection unit 121 about the second pivot 123 and slides along the support surface 112 from the empty position (Fig. 1) to the operating position (Fig. 2), specifically along a direction of movement (horizontal direction in Figs. 1 to 3) that is perpendicular to the insertion direction of the cartridge 2.

[0054] The first detection unit 121 further comprises a contact surface 1211, which in Fig. 1 is arranged at an angle other than 0° to the insertion direction of the cartridge 2. When the cartridge 2 is inserted into the receiving unit 11, the cartridge 2 comes into contact with the contact surface 1211 and exerts a force on the contact surface 1211, so that the first detection unit 121 is moved relative to the receiving unit 11 from the first position to the second position. When the cartridge is inserted, as seen in Fig. 2, the contact surface 1211 is arranged at an angle of 0° to the insertion direction of the cartridge 2 and is aligned with a side wall 111 of the receiving unit 11. Furthermore, the contact surface 1211 then rests against the cartridge 2 and is pretensioned in the direction of the cartridge 2 by the spring force of the spring element 15, so that the cartridge 2 is held stably in the receiving unit 11.

[0055] Furthermore, Fig. 2 shows that when the cartridge 2 is inserted into the receiving unit 11, the detection device 12 is arranged entirely in a recess of the side wall 111, wherein the side wall 111 runs parallel to the insertion direction and along a circumferential direction of the cartridge 2.

[0056] Fig. 2 shows a normal state of the dosing device 1, in which the cleaning fluid can flow out of the outlet 18 as described above. As a result, the level of the cleaning fluid in the receiving unit 11 is below a first threshold, i.e., there is no excess level of cleaning fluid. Due to the force of gravity acting on it, the second detection unit 12 rests on the support surface 112 and is in the operating position.

[0057] Fig. 3, on the other hand, shows a fault state of the dosing device 1 in which the drain 18 is blocked, so that the cleaning liquid cannot flow away. As a result, the level of the cleaning liquid is above a second threshold, i.e., an overlevel is present. When the level of the cleaning liquid rises to the second threshold, a buoyancy force of the cleaning liquid acts on the second detection unit 122, causing the second detection unit 122 to be rotated about the second pivot 123 and thereby moved from the operating position (Fig. 2) to the overflow position (Fig. 3). As can be seen in Fig. 3, in this state the second detection unit 122 floats at least partially on the cleaning liquid. As can also be seen in Figs. 1 to 3, the dosing unit 1 comprises a sensor 14 which comprises a first magnetic switch 141a and a magnet 142.The first magnetic switch 141a is attached to a housing of the receiving unit 11 and is therefore immobile relative to the receiving unit 11. The magnet 142 is attached to the second detection unit 122 and can therefore assume different positions relative to the magnetic switch 141. The distance of the magnet 142 from the first magnetic switch 141a is smaller when the second detection unit 142 is in the operating position (Fig. 2) than when the second detection unit 142 is in the empty position (Fig. 1) or the overflow position (Fig. 3). The first magnetic switch 141a is configured such that it is only actuated oronly outputs a first detection signal when the distance between the magnet 142 and the first magnetic switch 141a falls below a predetermined minimum distance, so that it outputs the first detection signal when the second detection unit 142 is in the operating position, but does not output the first detection signal when the second detection unit 142 is in the empty position or the overflow position.

[0058] The first detection signal is transmitted to a controller, which controls the dosing of the cleaning agent from the cartridge 2 based on the first detection signal. If the second detection unit 122 is arranged in the operating position and the controller receives the first detection signal, the controller can, for example, open or keep open a solenoid valve in the fresh water inlet so that fresh water is sprayed into the cartridge 2, thereby enabling dosing of the cleaning agent. If, however, the second detection unit 122 is arranged in the empty position or the overflow position and the controller does not receive the first detection signal, the controller can close or keep closed the solenoid valve so that no further fresh water flows in, thus preventing dosing of the cleaning agent.

[0059] In summary, the following two switching states can be distinguished via the relative position of the magnet 142 to the first magnetic switch 141a: 1. Dosing possible (cartridge 2 inserted and no excess level present, as shown in Fig. 2), 2. Dosing not possible (cartridge 2 not inserted and / or excess level present, as shown in Fig. 1 or Fig. 3).

[0060] Optionally, the dosing unit 1 further comprises a second magnetic switch 141b, wherein the first magnetic switch 141a and the second magnetic switch 141b are attached to different locations on the receiving unit 11. The distance of the magnet 142 from the second magnetic switch 141b is smaller when the second detection unit 122 is in the overflow position (Fig. 3) than when the second detection unit 122 is in the operating position (Fig. 2) or the empty position (Fig. 1). The second magnetic switch 141b is configured such that it is actuated oronly outputs a second detection signal when the distance between the magnet 142 and the second magnetic switch 141b falls below a predetermined minimum distance, so that it outputs the second detection signal when the second detection unit 142 is in the overflow position, but does not output the second detection signal when the second detection unit 142 is in the empty position or the operating position.

[0061] In this way, as described above, the position of the second detection unit 122 can be determined by combining the first and second detection signals: When the first detection signal is output and the second detection signal is not output, the second detection unit 122 is in the operating position (Fig. 2). When the first detection signal is not output and the second detection signal is output, the second detection unit is in the overflow position (Fig. 3). When neither the first detection signal nor the second detection signal is output, the second detection unit is in the empty position (Fig. 1). For example, the controller can output an empty warning signal when the detection unit 122 is arranged in the empty position and an overflow warning signal when the detection unit 122 is arranged in the overflow position.The user can therefore use the warning signal to determine whether, for example, no cartridge 2 is inserted or there is an excess level, and take appropriate measures to correct the error.

[0062] Fig. 4A shows a schematic view of a cleaning device with an integrated dosing unit 1, and Fig. 4B shows a schematic view of a cleaning device with an external dosing unit 1. In this embodiment, the cleaning device is a dishwasher. The dishwasher comprises a dishwasher housing 4 and a washing chamber 3, which includes a washing tank 31 and a dispensing device 32.

[0063] In Fig. 4A, the dosing unit 1 is a component of the dishwasher and is thus integrated into the dishwasher. Furthermore, in Fig. 4A, a water safety device 6 is integrated into the dishwasher. The fresh water from the fresh water connection 5 is first directed to the water safety device 6. From there, it can flow via a first branch to the dosing unit 1 to be used for dosing the detergent as described above, and via a second branch to the wash chamber 3 to be used for filling and / or rinsing the machine. In contrast, in Fig. 4B, the dosing unit 1 is designed separately from the dishwasher and is thus an external component. In this case, the water safety device 6 is also designed separately from the dishwasher and is thus an external component.The water from the fresh water connection 5 is first fed to the water safety device 6 and from there to the dosing unit 1 to be used for dosing the cleaning agent as described above.

[0064] Otherwise, however, the features and modes of operation of the dosing unit 1 are analogous in both cases as described above. In particular, Fig. 4A and Fig. 4B each show the cartridge 2 filled with the cleaning agent, which is inserted into the dosing unit, and the outflow of the cleaning liquid, i.e. the solution of the cleaning agent in the fresh water, from the dosing unit 1 into the wash tank 31 and from there into the dispensing device 32 in order to be used for a washing process of the dishwasher. In another embodiment, it is also possible for the cleaning liquid, i.e. the solution of the cleaning agent in the fresh water, to be fed directly to one or more dispensing devices of a dishwasher or another cleaning device, optionally with the interposition of heating devices and / or heat exchangers.

[0065] List of reference symbols

[0066] I Dosing unit

[0067] II Recording unit

[0068] III Side wall

[0069] 112 contact surface

[0070] 12 Detection device

[0071] 121 First detection unit

[0072] 1211 contact surface

[0073] 122 Second detection unit

[0074] 13 First swivel joint

[0075] 123 Second swivel joint

[0076] 14 Sensor

[0077] 141a First magnetic switch

[0078] 141b Second magnetic switch

[0079] 142 Magnet

[0080] 15 spring element

[0081] 16 Spray unit Inlet Outlet Cartridge Washing chamber Washing tank Dispensing device Dishwasher housing Fresh water connection Water safety device

Claims

Dosing unit for a cleaning device and cleaning device Claims 1. A dosing unit (1) for a cleaning device, wherein the dosing unit (1) comprises a receiving unit(s) for inserting a cartridge (2) containing a cleaning agent for a cleaning process of the cleaning device into the receiving unit (11) and for removing the cartridge (2) from the receiving unit (11); characterized in that: the dosing unit (1) further comprises a detection device (12) for detecting both whether the cartridge (2) is inserted into the receiving unit (11) or removed from the receiving unit (11) and for detecting a level of a cleaning liquid containing the cleaning agent in the receiving unit (11); wherein the detection device (12) comprises a first detection unit (121) and a second detection unit (122); wherein the first detection unit (121) is arranged to be movable back and forth relative to the receiving unit (11) between a first position and a second position;wherein the first detection unit (121) and the second detection unit (122) are coupled to one another in such a way that a relative movement between the first detection unit (121) and the second detection unit (122) is possible at least in a specific position of the first detection unit (121) relative to the receiving unit (11); wherein the second detection unit (122) can assume an operating position, an empty position, and an overflow position relative to the receiving unit (11); and wherein the dosing unit (1) is configured in such a way that: when the cartridge (2) is removed from the receiving unit (11), the second detection unit (122) is arranged in the empty position; when the cartridge (2) is inserted into the receiving unit (11) and the level is below a first threshold value, the second detection unit (122) is arranged in the operating position, and; when the cartridge (2) is inserted into the receiving unit (11) and the level is above a second threshold value which is greater than or equal to the first threshold value, the second detection unit (122) is arranged in the overflow position.

2. Dosing unit (1) according to claim 1, further comprising: a controller configured to control a dosage of the cleaning agent from the cartridge (2) based on the position of the second detection unit (122).

3. Dosing unit (1) according to claim 2, wherein the controller is configured to: enable the dosing of the cleaning agent from the cartridge (2) when the second detection unit (122) is arranged in the operating position, and prevent the dosing of the cleaning agent from the cartridge (2) when the second detection unit (122) is arranged in the empty position or the overflow position.

4. Dosing unit (1) according to one of the preceding claims, further comprising: a sensor (14) configured to detect a position of the second detection unit (122) and output a first detection signal based on the detected position; and wherein preferably the controller is configured to control the dosing of the cleaning agent from the cartridge (2) based on the first detection signal.

5. Dosing unit (1) according to claim 4, wherein the sensor (14) comprises a first magnetic switch (141a) and a magnet (142); wherein the first magnetic switch (141a) is attached to the receiving unit (11); wherein the magnet (142) is attached to the second detection unit (122); and wherein the sensor (14) detects the position of the second detection unit (122) based on an arrangement of the magnet (142) relative to the first magnetic switch (141a), in particular based on a distance of the magnet (142) from the first magnetic switch (141a).

6. Dosing unit according to claim 5, wherein the sensor (14) further comprises a second magnetic switch (141b) attached to the receiving unit (11), wherein the second magnetic switch (141b) is different from the first magnetic switch (14b); and wherein the sensor (14) detects the position of the second detection unit (122) based on an arrangement of the magnet (142) relative to the first magnetic switch (141a) and the second magnetic switch (141b), in particular based on a distance of the magnet (142) from the first magnetic switch (141a) and a distance of the magnet (142) from the second magnetic switch (141b). 7- Dosing unit (1) according to one of the preceding claims, wherein the dosing unit (i) comprises a spring element (15) which is designed such that the first detection unit (121) is pretensioned in the first position when no cartridge (2) is inserted and, when the cartridge (2) is inserted into the receiving unit (11), the first detection unit (121) is moved from the first position to the second position against the spring force of the spring element (15).

8. Dosing unit (1) according to one of the preceding claims, wherein the dosing unit (1) is designed such that when the cartridge (2) is inserted into the receiving unit (11) and the level rises from the first threshold value to the second threshold value, a buoyancy force of the cleaning liquid acts on the second detection unit (122) so that the second detection unit (122) is moved from the operating position to the overflow position.

9. Dosing unit (1) according to claim 8, i) wherein the second detection unit (122) comprises a cavity in which a buoyancy element is arranged, wherein preferably the buoyancy element is an air cushion; or ii) wherein the second detection unit (122) is made of a material having a lower density than the cleaning liquid, preferably a lower density than 1 g / cm3.

10. Dosing unit (1) according to one of the preceding claims, wherein the cleaning agent is a solid cleaner; and wherein the cleaning liquid is a solution of the solid cleaner.

11. Dosing unit (1) according to claim 10, further comprising: a spray unit (16) for spraying fresh water into the cartridge (2) so that the cleaning liquid is formed by dissolving the solid cleaner contained in the cartridge (2) in the fresh water and flows out of the cartridge (2) into the receiving unit (11).

12. Dosing unit (1) according to claim 11, wherein the controller is configured to: enables the spraying of fresh water from the spray unit (16) when the detection unit is arranged in the operating position, and prevents the spraying of fresh water from the spray unit (16) when the detection unit is arranged in one of the empty position and the overflow position.

13. Dosing unit (1) according to one of the preceding claims, wherein the receiving unit (11) comprises a side wall (111) arranged parallel to an insertion direction of the cartridge (2); and wherein, when the cartridge (2) is inserted into the receiving unit (11), the detection device (12) is arranged in a recess of the side wall (111).

14. Dosing unit (1) according to one of the preceding claims, wherein the second detection unit (122) is arranged to be linearly movable between the operating position and the empty position along a direction of movement; wherein this direction of movement of the second detection unit differs from an insertion direction of the cartridge (2).

15. Dosing unit (1) according to one of the preceding claims, wherein the first detection unit (121) is fastened to the receiving unit (11) by means of a first rotary joint (13), so that the first detection unit (121) is arranged rotatably relative to the receiving unit between the first and the second position.

16. Dosing unit (1) according to claim 15, wherein the first detection unit (121) comprises a contact surface (1211); wherein, when the level is below the first threshold and the cartridge (2) is removed from the receiving unit (11), the contact surface (1211) is arranged at an angle other than 0° to an insertion direction of the cartridge (2); and wherein, preferably, when the cartridge (2) is inserted into the receiving unit (11), the contact surface (1211) bears against the cartridge (2) and / or is prestressed in the direction of the cartridge (2) by the spring force of the spring element (15).

17. Dosing unit (1) according to claim 15 or 16, wherein the second detection unit (122) is fastened to the first detection unit (121) by means of a second rotary joint (123), so that at least in the specific position of the first detection unit, the second detection unit is arranged rotatably relative to the first detection unit.

18. Dosing system for a cleaning device, comprising the dosing unit (1) according to one of the preceding claims and the cartridge (2).

19. Cleaning device comprising the dosing unit (1) according to one of claims 1 to 17.

Images