Domestic dishwasher and method

Abstract

The invention relates to a domestic dishwasher (1) having a washing chamber (2) for receiving items to be cleaned (39), a pump sump (16) arranged on the washing chamber (2), a filter system (17) having a surface filter (18) which at least partially covers the pump sump (16), at least one dirt transport device (50, 53), and a control device (38), wherein the at least one dirt transport device (50, 53) is designed to clean a surface of the surface filter (18) facing the washing chamber (2) and to move dirt (56) deposited on the surface filter (18) into a soiled region (20) of the pump sump (16) in a targeted manner during the cleaning process, wherein a drain pump (23) is connected to a lower end of the soiled region (20) and the control device (38) is designed to control such that the at least one dirt transport device (50, 53) is deactivated for a first period of time (S1) after a detergent (91) is added to the washing chamber (2), in order to prevent the at least one dirt transport device (50, 53) from feeding the detergent (91) introduced into the washing chamber (2) into the soiled region (29) of the pump sump (16).

Description

Technical Field

[0001] This invention relates to a household dishwasher. Background Technology

[0002] The dishwasher has a cleaning chamber in which laundry is contained. To spray the laundry with cleaning fluid and / or fresh water, a spraying device, such as a rotatable spray arm, can be installed in the cleaning chamber. These spraying devices form part of the dishwasher's hydraulic circuit. A pump pit is located on the lower side of the cleaning chamber, to which a filtration system is attached. The filtration system includes a surface filter that at least partially covers the pump pit, and a fine or micro-sieve, typically cylindrical, disposed inside the pump pit. A circulation pump is connected to the pump pit and supplies the filtered cleaning fluid and / or fresh water to the spraying device via the filtration system, supplied through the hydraulic circuit. Furthermore, a drain pump is also connected to the pump pit and configured to remove contaminated cleaning fluid and / or fresh water from the hydraulic circuit.

[0003] Because the filtration system bears a high load of dirt during dishwasher washing, periodic manual cleaning of the clogged fine or micro screens may be necessary to maintain good filtration and thus ensure good washing performance. In contrast, based on internal operating experience, cleaning nozzles can be installed in the spray unit, for example, to clean the surface filter. However, since the fine or micro screens are located in the pump pit below the surface filter, automatic cleaning is not possible, or can only be achieved with significant structural design costs. Summary of the Invention

[0004] In this context, one object of the present invention is to provide an improved household dishwasher.

[0005] According to a first aspect, a household dishwasher is proposed, comprising: a washing chamber for receiving laundry; a pump pit disposed on the washing chamber; a filtration system having a surface filter that at least partially covers the pump pit; a waste conveying device; and a controller. Here, the waste conveying device is designed to clean the surface of the surface filter facing the washing chamber and, during cleaning, to selectively move dirt deposited on the surface filter into an unclean area of ​​the pump pit, wherein a drain pump is connected to the lower end of the unclean area, and the controller is designed to deactivate the waste conveying device for a first period after detergent is added to the washing chamber, to prevent the waste conveying device from diverting detergent introduced into the washing chamber into the unclean area of ​​the pump pit.

[0006] The inclusion of a waste conveying device enables faster waste separation. This results in shorter cleaning times, lower detergent requirements, better cleaning performance, and more consistent cleaning results. Because the waste conveying device directly moves dirt into the unclean area of ​​the pump pit, it can be directly pumped out from the unclean area using a drain pump. Since the waste conveying device is inactive for the initial period after detergent is added to the cleaning chamber, it prevents detergent introduced into the cleaning chamber from being introduced into the unclean area of ​​the pump pit, thus avoiding unintended detergent discharge. This ensures that the entire amount of detergent dissolves in the hydraulic circuit and can be used to clean the items.

[0007] The washing chamber is preferably rectangular. The washing chamber can be closed by means of a door pivotally hinged to it. Multiple dish receiving sections, such as a lower basket, an upper basket, and a dish drawer, may be provided within the washing chamber. The dish receiving sections can hold the dishes, which are loaded with washing liquid and / or fresh water via a hydraulic circuit of the dishwasher. "Loading" here may include spraying or wetting the dishes. "Washing liquid" here should be understood as water containing additives (e.g., detergent and / or rinsing agent and / or dirt particles detached from the dishes). Here, "installed" in the washing chamber should be understood in particular as the pump pit being mounted or fitted onto the washing chamber. In particular, the pump pit may be installed on the bottom of the washing chamber. The pump pit may be part of the bottom. The pump pit may also be referred to as a pump basin.

[0008] According to one embodiment, the filtration system has a separation filter in addition to a surface filter, which divides the pump pit into an unclean area and a clean area.

[0009] Therefore, the filtration system preferably comprises multiple components, including a surface filter and a separator filter. The surface filter and separator filter are preferably at least partially removable from the cleaning chamber. The term "separate" in "the separator filter divides the pump pit into unclean and clean areas" specifically means that the separator filter is at least partially positioned between the unclean and clean areas. The bottom areas of the unclean and / or clean areas are preferably at least partially formed by the bottom of the pump pit.

[0010] Both the surface filter and the separator filter are at least partially permeable to fluid. "Permeable to fluid" here means that cleaning fluid and / or fresh water can flow through the surface filter and / or separator filter. The permeable sections of the surface filter and separator filter each have an opening with multiple through holes.

[0011] The waste conveying device is specifically designed to clean the surface of the surface filter facing the cleaning chamber, and for this purpose, to selectively and directly convey dirt, including food residue, from the surface filter to the uncleaned area of ​​the pump pit. This conveying can be done mechanically, for example, by an automatically moving broom, scraper, or squeegee. That is, the waste conveying device can particularly include a broom, scraper, and / or squeegee. Alternatively, the waste conveying device can also consist of one or more nozzles that generate jet streams to move dirt into the uncleaned area. In this case, the movement or conveying of dirt is achieved by means of a jet stream. In other words, dirt is selectively conveyed or propelled into the uncleaned area by means of cleaning fluid and / or fresh water. A waste conveying device can also be provided that simultaneously utilizes mechanical cleaning tools and jet streams to achieve the targeted conveying of dirt.

[0012] Here, the waste conveying device is understood to be in a disabled state if it fails to perform its primary task—namely, failing to clean the surface of the surface filter facing the cleaning chamber and failing to specifically move the dirt deposited on the surface filter into the unclean area of ​​the pump pit. This state can be achieved either by at least partially stopping the waste conveying device or by taking additional measures to prevent or at least significantly reduce its effectiveness. At least partial stopping can be achieved, for example, by not controlling the waste conveying device. If rotational or linear motion of the waste conveying device is required to accomplish the aforementioned primary task, at least partial stopping can also be achieved by mechanically blocking such motion. The ultimate key is that, in the initial period after the addition of detergent, the detergent just added to the cleaning chamber and thus located on the surface filter should be prevented from being mistaken for "dirt" by the waste conveying device and directly conveyed into the unclean area of ​​the pump pit, and then pumped out from there, thus being discharged before it has performed its cleaning function.

[0013] In one embodiment, a circulation pump is connected to a clean area.

[0014] The drain pump and circulation pump preferably form part of the hydraulic circuit. Both the drain pump and circulation pump are arranged adjacent to the pump pit, and preferably mounted on the pump pit. The drain pump and circulation pump are preferably arranged and mounted on the pump pit such that the pump pit is located between the drain pump and the circulation pump. The unclean area of ​​the pump pit can also be referred to as the contaminated area. The clean area can also be referred to as the circulation area. A separator filter, especially a fluid-permeable separator filter section, is arranged between the unclean area and the clean area. For filtering cleaning fluid and / or fresh water, a portion of it flows from the unclean area into the clean area through the separator filter, especially through the separator filter section. Contaminant particles are trapped here by the separator filter, especially by the separator filter section, on the unclean area side.

[0015] Surface filters can have any geometric shape. Surface filters are preferably annular or segmental. However, surface filters can also be rectangular or elliptical. The filtration system is preferably removable. In particular, the separator filter can also be removed from the surface filter. Thus, for example, the separator filter can be removed from a household dishwasher without removing the surface filter. The separator filter can be form-fitted with the surface filter. The form-fitting connection is formed by the interlocking or snap-fitting of the two components. For example, the separator filter and the surface filter are snap-fitted together. The surface filter can be, for example, a perforated metal plate, a plastic-coated metal mesh, or a plastic component, or have the above-described structure. Any combination of these embodiments is also conceivable. It is particularly advantageous for the surface filter to have sections with different perforation structures or different filtration effects. The same applies to separator filters. Separator filters, especially separator filter sections, are particularly preferably made of grid-like or mesh-like synthetic material components.

[0016] Where a waste conveying device is "designed" to selectively move dirt into unclean areas, it should be particularly understood here that the waste conveying device moves, transports, or propels dirt from the surface of the surface filter facing the cleaning chamber toward the unclean area by means of a fluid (especially in the form of cleaning fluid and / or fresh water) or mechanical means. "Mechanical" here should be understood in particular as: the waste conveying device may be constructed, for example, in the form of a broom, scraper, and / or wiper. If the transport of dirt is achieved by means of cleaning fluid and / or fresh water, the waste conveying device may consist of one or more nozzles that move or transport dirt toward the unclean area by means of one or more jets.

[0017] According to one embodiment, a household dishwasher has at least one spray device, particularly a rotatably supported spray arm, for loading cleaning fluid and / or fresh water onto the items to be cleaned, wherein at least one waste conveying device is preferably mounted on the spray device.

[0018] In particular, the waste conveying device is installed on the lower side of the spray device. The spray device can move during the operation of the household dishwasher, especially in the direction of rotation, but it can also move in a straight line. For this purpose, a drive nozzle can be provided, from which cleaning fluid and / or fresh water can flow, so that the spray device rotates in the direction of rotation or moves in a straight line in one direction.

[0019] As an alternative to driving nozzles, the spraying device can also be actively driven, for example by using an electric motor.

[0020] If the spray system is designed as a spray arm, the waste conveying device can be installed at a radial position on the spray arm. This makes it particularly easy to utilize the kinetic energy of the spray arm to convey waste particles to the unclean area. Furthermore, the spray arm can advantageously be used both to mount the waste conveying device and to load cleaning fluid and / or fresh water onto the cleaned material.

[0021] According to another embodiment, at least one waste conveying device includes at least one nozzle.

[0022] A waste conveying device may include multiple nozzles, but multiple waste conveying devices may also be provided, each including one or more nozzles. Nozzles may also be referred to as filter cleaning nozzles. Alternatively, as mentioned above, the waste conveying device may also be constructed using, for example, a broom, scraper, squeegee, or other suitable mechanical device. Combinations of one or more mechanical devices with one or more nozzles are also conceivable.

[0023] According to another embodiment, at least one waste conveying device is designed to generate at least one jet stream that is oriented at an angle relative to the surface filter.

[0024] If multiple waste conveying devices are provided, they can also generate multiple jet streams. Alternatively, a single waste conveying device can generate multiple jet streams. The jet streams are oriented, in particular, at an angle relative to the surface filter, so that the jet streams selectively move dirt into the unclean area of ​​the pump pit through an inlet opening. The jet streams can also be oriented in such a way that the jet streams move or transport dirt from the bottom of the cleaning chamber toward the surface filter. The jet streams are oriented, in particular, at an angle relative to a rotating shaft about which the spray device, especially the spray arm, is rotatably supported.

[0025] According to another embodiment, at least one jet stream has a directional component at least at certain times, which is oriented from the outer edge of the surface filter toward the inner edge of the surface filter.

[0026] As a result, the dirt moves against the radial direction of the surface filter, which is oriented from the inner edge to the outer edge. In this way, the dirt can be transported from the bottom of the cleaning chamber to the surface filter, and then cleaned by another jet or mechanical unit, i.e., by targeting the dirt into the unclean area of ​​the pump pit.

[0027] According to another embodiment, the controller is designed to control the spraying device and / or waste conveying device so that no pressure is applied during the first time period.

[0028] It should be understood here that the spraying device and / or waste conveying device are not actively pressured, i.e., they are not controlled or driven at all. Therefore, the pressure acting on the spraying device and / or waste conveying device is only passively generated, such as pressure generated by hydrostatic pressure.

[0029] According to another embodiment, the controller is designed to control such that during a first time period, the pressure on the spray device and / or the waste conveying device is at most less than a predetermined pressure threshold necessary to activate the waste conveying device.

[0030] Here, the waste conveying device is considered "activated" if it has completed its primary task of cleaning the surface filter facing the cleaning chamber and selectively moving the dirt deposited on the surface filter into the unclean area of ​​the pump pit. If the spray device needs to move (rotational or linear) to complete this task, the pressure threshold can be preset so that when the pressure applied to the spray device is below this pressure threshold, the spray device remains in a fixed position, especially maintaining rotational fixation.

[0031] The spraying device and / or waste conveying device can be configured such that when the applied pressure is less than a predetermined pressure threshold, the spraying device does not move, thus the surface filter does not perform a cleaning action; but at the same time, at least a small amount of cleaning fluid and / or fresh water still flows out from the spraying device and / or waste conveying device, thereby supporting and accelerating the dissolution of detergent. Here, the pressure used to load the spraying device and / or waste conveying device is still insufficient, for example, to cause the spraying device to rotate.

[0032] It can also be proposed that during the first time period, the spray device be fixed mechanically and / or electronically, i.e., prevented from moving, especially from rotating about its axis. This prevents detergent introduced into the cleaning chamber from being transported to unclean areas; on the other hand, the cleaning fluid and / or fresh water flowing from the spray device also supports the dissolution of the detergent. With the spray device or waste conveying device fixed or blocked, the pressure during the first time period can even be selected to be sufficiently high, such that the waste has already been loaded with cleaning fluid and / or fresh water and thus washed during the first time period. In this case, the pressure can also exceed a predetermined pressure threshold.

[0033] According to another embodiment, the waste conveying device has a so-called dynamic nozzle. Here, a dynamic nozzle should be understood as: the nozzle only sprays cleaning fluid and / or fresh water from a predetermined pressure threshold.

[0034] Below the pressure threshold, the nozzle remains closed, preventing the flow of cleaning fluid and / or fresh water. Therefore, the controller is designed to control the spray device and / or waste conveying device during the first time period, ensuring that the pressure is at most below the predetermined pressure threshold of the dynamic nozzle. Since the waste conveying device itself remains inactive in this condition, there is no need to prevent its movement (if it is configured to be movable). Thus, the spray device can both load cleaning fluid and / or fresh water onto the object being cleaned during the first time period (e.g., using a non-dynamic nozzle oriented towards the object) and rotate about its axis. This allows the object to be thoroughly loaded with cleaning fluid and / or fresh water and thus washed during the first time period, while preventing detergent introduced into the cleaning chamber from being delivered to unclean areas.

[0035] According to one embodiment, the controller is designed to control such that, during a second time period after the addition of detergent, the spray device and / or waste conveying device are subjected to at least one pressure higher than a predetermined pressure threshold.

[0036] The second phase follows immediately after the first phase. During the second phase, the waste conveying device is therefore subjected to a higher pressure compared to the first phase. The switch from the first phase to the second phase is specifically designed such that the pressure used to load the waste conveying device is increased. This increased pressure is at least high enough to activate the waste conveying device. Therefore, the waste conveying device is activated when switching from the first phase to the second phase. This ensures that the waste conveying device is activated only after the detergent introduced into the cleaning chamber has completely dissolved. The input of detergent introduced into the cleaning chamber into the unclean area of ​​the pump pit by the waste conveying device is thus avoided.

[0037] According to another embodiment, the household dishwasher has other spray devices in addition to the spray device, wherein the controller is designed to control the other spray devices such that they are subjected to at least one pressure higher than a predetermined pressure threshold during a first time period and a second time period.

[0038] For this purpose, the household dishwasher has two spray units. Unlike the spray unit that experiences different pressures during the first and second washing cycles, the other spray unit is preferably loaded with the same pressure during both cycles. Therefore, while the waste conveying device is deactivated during the first cycle to avoid delivering detergent introduced into the washing chamber to the pump pit, the other spray unit can still load washing liquid and / or fresh water onto the laundry. This results in time savings during the washing cycle.

[0039] According to another embodiment, the controller is designed to control such that during a first time period (the period during which the waste conveying device should be in a deactivated state), the level of the cleaning fluid and / or fresh water is in a raised state and / or the amount of bath water in the cleaning chamber rises above the surface filter; and during a second time period (the period during which the waste conveying device should subsequently be in an activated state), the level of the cleaning fluid and / or fresh water is in a lower state and / or the amount of bath water in the cleaning chamber is reduced below the surface filter.

[0040] By raising the level of the cleaning solution and / or fresh water and / or the volume of bath water in the cleaning chamber above the surface filter, the water jets ejected by the waste conveying device will reach the cleaning solution and / or fresh water in the cleaning chamber above the surface filter. The kinetic energy of the water jets from the waste conveying device is dissipated upon entering the bath, thus eliminating the pushing effect of the waste conveying device. Therefore, the effectiveness of the waste conveying device can also be prevented or at least significantly reduced by this additional measure. In this case, it is also necessary to prevent the detergent introduced into the cleaning chamber from entering the unclean area of ​​the pump pit by the waste conveying device.

[0041] According to the second aspect, a method for operating a household dishwasher is proposed, the dishwasher having a washing chamber for receiving laundry, a pump pit disposed on the washing chamber, a filtration system (the filtration system having a surface filter that at least partially covers the pump pit), and a waste conveying device, wherein the waste conveying device is designed to clean the surface of the surface filter facing the washing chamber and to selectively move dirt deposited on the surface filter into an unclean area of ​​the pump pit during the cleaning process, wherein a drain pump is connected to the lower end of the unclean area, and the waste conveying device is deactivated for a first period of time after detergent is added to the washing chamber to prevent the waste conveying device from inputting detergent introduced into the washing chamber into the unclean area of ​​the pump pit.

[0042] The features and advantages described for the household dishwasher of the present invention can also be applied to the method of the present invention.

[0043] Other possible implementations of a household dishwasher include combinations of features or implementations described previously or hereinafter in conjunction with embodiments, even if such combinations are not explicitly mentioned. Those skilled in the art will also incorporate individual aspects as improvements or additions to the basic form of the corresponding household dishwasher. Attached Figure Description

[0044] Other advantageous designs and aspects of household dishwashers are the subject of the dependent claims and the embodiments of household dishwashers described below. Preferred embodiments of the household dishwasher will be further described below with reference to the accompanying drawings.

[0045] Figure 1 A perspective view showing one embodiment of a household dishwasher; Figure 2 Showing according to Figure 1 A schematic cross-sectional view of a household dishwasher; Figure 3 Showing according to Figure 1 A schematic top view of one embodiment of the filtration system of a household dishwasher; Figure 4 Showing according to Figure 3 View IV; Figure 5 Showing according to Figure 3 A schematic side view of the filtration system; Figure 6 Showing according to Figure 3 Another schematic top view of the filtration system; Figure 7 Showing according to Figure 3 A schematic top view of one embodiment of a filtration system using a separator filter; Figure 8 Showing according to Figure 1 A schematic cross-sectional view of another embodiment of a filtration system for a household dishwasher; Figure 9 Showing according to Figure 8 An improved schematic diagram of one embodiment of a filtration system using a separator filter; Figure 10 Showing according to Figure 3 Another schematic top view of the filtration system; Figure 11 Showing according to Figure 3 A schematic cross-sectional view of the filtration system; Figure 12 Showing according to Figure 3 Another schematic cross-sectional view of the filtration system; Figure 13 Showing according to Figure 7 Another schematic top view of the separator filter; Figure 14 Showing according to Figure 7 Another schematic top view of the separator filter; Figure 15 Showing according to Figure 3 Another schematic cross-sectional view of the filtration system; Figure 16 Showing according to Figure 3 A schematic partial cross-sectional view of one embodiment of the support cone of the filtration system; Figure 17 Showing according to Figure 7 Another schematic top view of the separator filter; Figure 18 Show along Figure 17 A schematic cross-sectional view of the separator filter with section lines XVIII-XVIII; Figure 19 Showing according to Figure 1 Another schematic cross-sectional view of a household dishwasher; and Figure 20 Showing the method for running according to Figure 1 A schematic block diagram illustrating the method of using a household dishwasher.

[0046] In the accompanying drawings, elements that are the same or have the same function are represented by the same reference numerals, unless otherwise specified. Detailed Implementation

[0047] Figure 1 A perspective view of one embodiment of a household dishwasher 1 is shown. The household dishwasher 1 includes a washing chamber 2, which can be closed, particularly watertight, by means of a door 3. For this purpose, a sealing device may be provided between the door 3 and the washing chamber 2. The washing chamber 2 is preferably cuboid in shape. The washing chamber 2 can be arranged within the housing of the household dishwasher 1. The washing chamber 2 and the door 3 can form a washing space 4 for washing the items to be washed.

[0048] Figure 1 The middle door 3 is in the open position. Door 3 is pivotable about a pivot axis 5 located at its lower end, thereby closing or opening door 3. The loading opening 6 of the cleaning chamber 2 can be closed or opened by means of door 3. The cleaning chamber 2 has a bottom 7, a top 8 opposite to the bottom 7, a rear wall 9 opposite to the closed door 3, and two side walls 10 and 11 opposite to each other. The bottom 7, top 8, rear wall 9, and side walls 10 and 11 may be made of stainless steel, for example. Alternatively, the bottom 7 may be made of plastic material, for example.

[0049] The household dishwasher 1 also has at least one dish receiving section 12 to 14. Preferably, multiple, for example, three dish receiving sections 12 to 14 can be provided, wherein dish receiving section 12 can be a lower dish receiving section or a lower basket, dish receiving section 13 can be an upper dish receiving section or an upper basket, and dish receiving section 14 can be a dish drawer. Figure 1 As further shown, the cutlery receiving parts 12 to 14 are arranged stacked vertically within the washing chamber 2. Each cutlery receiving part 12 to 14 can be selectively moved into or out of the washing chamber 2. In particular, each cutlery receiving part 12 to 14 can be pushed into or driven into the washing chamber 2 in the pushing direction E, and can be pulled out or driven out of the washing chamber 2 in the pulling direction A, which is opposite to the pushing direction E.

[0050] Figure 2 A schematic cross-sectional view of a household dishwasher 1 is shown.

[0051] In addition to the washing chamber 2, the household dishwasher 1 also includes a base support 15 that supports the washing chamber 2. The base support 15 is, for example, a plastic component, particularly an injection-molded plastic component. The base support 15 is box-shaped or cuboid in shape. Figure 2 In the orientation, the direction of gravity g is from top to bottom. The household dishwasher 1 is equipped with a coordinate system having a width direction (x), a height direction (y), and a depth direction (z). The x, y, and z directions are perpendicular to each other.

[0052] A pump recess 16 is provided on the bottom 7. The pump recess 16 is cup-shaped and... Figure 2 The orientation extends downward from the bottom 7. The pump pit 16 may be a plastic part, particularly an injection-molded plastic part. The filtration system 17 includes a face filter or surface filter 18, which at least partially covers the pump pit 16. The surface filter 18 thus at least partially replaces the bottom 7 of the cleaning chamber 2.

[0053] The filtration system 17 also includes a separator or partition filter 19, which is at least partially disposed within the pump pit 16. The partition filter 19 divides the pump pit 16 into an unclean area 20 and a clean area 21, and may be configured, for example, as a plate. Cleaning fluid and / or fresh water F can enter the clean area 21 through the surface filter 18. Furthermore, the cleaning fluid and / or fresh water F can also flow bidirectionally between the unclean area 20 and the clean area 21 through the partition filter 19. The unclean area 20 may also be referred to as the contaminated area. The clean area 21 may also be referred to as the circulation area.

[0054] A discharge port 22 extends from the pump pit 16, particularly from the unclean area 20. A drain pump 23 is connected to the discharge port 22. With the help of the drain pump 23, contaminated cleaning fluid and / or fresh water F can be pumped away through the drain pipe 24. The drain pipe 24 can be connected to a fixed drain outlet of the building.

[0055] Furthermore, a discharge port 25 extends from the pump pit 16, particularly from the clean area 21. A circulation pump 26 is connected to the discharge port 25. The circulation pump 26 allows the cleaning solution and / or fresh water F to circulate within the washing space 4. The circulation pump 26 is, in particular, a heating pump and can therefore also be referred to as a heating pump. The circulation pump 26 is designed to circulate the cleaning solution and / or fresh water F. Furthermore, the circulation pump 26 is also designed to introduce heat into the cleaning solution and / or fresh water F. The circulation pump 26 can be fixed to the pump pit 16.

[0056] Both the drain pump 23 and the circulation pump 26 are preferably connected to the lower end of the unclean area 20 or the clean area 21, i.e., to the area in the pump pit 16 away from the surface filter 18. Therefore, the discharge ports 22 and 25 are respectively arranged in the lower half of the pump pit 22, preferably in the lower third of the pump pit 22. To completely or as completely as possible avoid residual water after being pumped out by the drain pump 23, the discharge port 22 of the drain pump 23 may be arranged at the lowest point of the unclean area 20.

[0057] The circulating pump 26 is in fluid communication with the water distributor 27. The water distributor 27 can be integrated into the circulating pump 26. With the help of the water distributor 27, the cleaning fluid and / or fresh water F delivered by the circulating pump 26 can be selectively distributed to different spray devices 28, 29, and 30 arranged within the cleaning chamber 2. With the help of the water distributor 27, the spray devices 28, 29, and 30 can be selectively loaded with cleaning fluid and / or fresh water F or not loaded.

[0058] Spray devices 28, 29, and 30 can be spray arms, but spray device 30 can also be configured as a top-spray swivel arm. Other spray devices (not shown) can also be provided, for example, to form (preferably connectable) enhanced spray zones, or to assist in filtration cleaning. For example, spray device 28 is located below the cutlery receiving section 12 and can be rotatably supported about a pivot 31 on the bottom 7, pump pit 16, filtration system 17, or circulation pump 26. Spray device 28 has nozzles that spray cleaning fluid and / or fresh water F onto... Figure 2 The water is sprayed upwards into the cutlery receiving section 12 and downwards towards the filter system 17.

[0059] The spray device 29 is rotatably mounted on the cutlery receiving section 13 about a pivot 32. The spray device 29 also has nozzles designed for spraying... Figure 2 The spraying device 30 sprays cleaning fluid and / or fresh water F downwards and / or upwards. The spraying device 30 is rotatably supported on the top 8 about a pivot 33. The spraying device 30 is in... Figure 2 The cleaning solution and / or fresh water F are loaded from the top towards the tableware receiving section 14.

[0060] The spray device 28 is fluidly connected to the circulation pump 26, and in particular to the water distributor 27, via the supply line 34. The circulation pump 26 can supply cleaning fluid and / or fresh water F to the spray device 28 through the supply line 34.

[0061] The spray device 29 is equipped with a supply line 35, which connects the spray device 29 to the circulation pump 26 in fluid communication. Through the supply line 35, the circulation pump 26 can supply cleaning fluid and / or fresh water F to the spray device 29.

[0062] The spraying device 30 is equipped with a supply line 36, which connects the spraying device 30 to the circulation pump 26 in fluid communication. Through the supply line 36, the circulation pump 26 can supply cleaning fluid and / or fresh water F to the spraying device 30.

[0063] Each spray unit 28, 29, 30 may be equipped with its own supply line 34, 35, 36. Alternatively, all spray units 28, 29, 30 may share a common supply line, which branches out. In particular, the supply lines 34, 35, 36 are formed from common components, especially common plastic injection molded components. The supply lines 34, 35, 36 extend along the rear wall 9 from the bottom 7 toward the top 8. The supply lines 34, 35, 36, or at least a portion thereof, may also extend through the filtration system 17, especially through the surface filter 18.

[0064] The circulation pump 26 preferably has a separate connection or fluid outlet for each supply line 34, 35, 36. The circulation pump 26, the spray devices 28, 29, 30, and the supply lines 34, 35, 36 together form the hydraulic circuit 37 of the household dishwasher 1. The circulation pump 26 circulates the cleaning fluid and / or fresh water F within this hydraulic circuit 37. The circulation pump 26 may be part of the hydraulic circuit 37, but this is not mandatory.

[0065] The household dishwasher 1 also includes a controller 38. With the aid of the controller 38, different washing programs of the household dishwasher 1 can be executed, for example. For this purpose, washing programs can be stored or saved in the controller 38. The controller 38 is preferably located outside the washing chamber 2.

[0066] The controller 38 may be disposed inside or on the door 3. The controller 38 is preferably disposed at the upper edge of the door 3 (not shown). However, the controller 38 may also be housed in the base support 15. The controller 38 may be operated or driven by an operating element (not shown). The operating element may include, for example, buttons, pushbuttons, and / or a touchscreen. These may be mounted on the door 3. Operation may also be achieved via an external device, such as a smartphone or tablet, through a wireless communication connection.

[0067] The controller 38 can drive the circulating pump 26. For example, the controller 38 can turn the circulating pump 26 on and off and / or change its speed. The controller 38 can receive and evaluate information from the circulating pump 26, such as the speed of the circulating pump 26 and / or the motor current of the circulating pump 26. In addition, the controller 38 can also drive the water distributor 27 to selectively turn the spray devices 28, 29, and 30 on or off.

[0068] The cleaning chamber 2 contains items 39 to be cleaned. Items 39 may include, for example, glasses, plates, pots, bowls, and tableware. Items 39 are particularly housed within... Figure 2 In the tableware receiving sections 12, 13, and 14 (not shown), cleaning solution and / or fresh water F can be applied to the items 39 to be cleaned using spray devices 28, 29, and 30.

[0069] Figure 3 A schematic top view of one embodiment of the filtration system 17 as described above is shown. Figure 4 It shows according to Figure 3 View IV. Figure 5 A side view of the filtration system 17 is shown. References will also be made below. Figures 3 to 5 .

[0070] The filtration system 17 includes a surface filter 18 as described above, which is annular in shape. The surface filter 18 has an outer edge 40, by virtue of which it can be supported on the bottom 7 of the pump tank 16 and / or the cleaning chamber 2. Furthermore, the surface filter 18 may correspond to an inner edge 41 opposite to the outer edge 40. The inner edge 41 and... Figure 3 The middle component 74 of the filtration system 17 (not shown) is connected to the spray device 28. Within the area of ​​this middle component 74, the shaft 31 of the spray device 28 extends. For example, the spray device 28 may be supported on the pump pit 16.

[0071] The surface filter 18 has an opening 42, which is only partially shown. The opening 42 includes a plurality of through holes 43, which are, for example, drilled holes. The through holes 43 can be circular. However, the through holes 43 can also be rectangular, especially square, triangular, honeycomb, or elliptical. The surface filter 18 can be made of plastic and / or metal materials. The filtration system 17 is provided with a radial direction R. The radial direction R is perpendicular to the axis of rotation 31 and oriented thereto toward the inner edge 41 of the surface filter 18. The surface filter 18 can be configured to be rotationally symmetric with respect to the axis of rotation 31, at least partially.

[0072] The filtration system 17 also includes a separator filter 19 as described above, which divides the pump pit 16 into an unclean area 20 and a clean area 21. The separator filter 19 can be removed for cleaning purposes. The separator filter 19 has… Figure 4 The inlet opening 44 is shown. The inlet opening 44 is closed by a grid-like coarse filter 45. The coarse filter 45 is permeable by fluid. The coarse filter 45 is adapted to prevent coarser contaminants from entering the unclean area 20 of the pump pit 16.

[0073] The separator filter 19 also includes a dirty area cover 46. The dirty area cover 46 is permeable by fluid. For this purpose, the dirty area cover 46 has an opening 47, which includes a plurality of through holes 48. The opening 42 and the opening 47 may be the same, but this is not necessary.

[0074] Figure 3A spray device 28 is shown, rotatably supported on a pump tank 16 about a pivot 31. Viewed radially in the direction R, the spray device 28 extends radially beyond the surface filter 18. Facing the surface filter 18, the spray device 28 has a first waste conveying device 50, which is designed herein as a nozzle. Alternatively, the first waste conveying device 50 may also be a scraper, blade, brush, or similar component, or may include multiple nozzles.

[0075] The first waste conveying device 50 is, in particular, a fan-shaped nozzle. The first waste conveying device 50 has a slit-shaped nozzle 51. By means of the nozzle 51, a fan-shaped jet stream 52 of cleaning fluid and / or fresh water F can be generated, which is directed obliquely toward the surface filter 18. The first waste conveying device 50 may also be referred to as a first filter cleaning nozzle.

[0076] In addition, the spray device 28 also has a second waste conveying device 53, which is also designed as a nozzle. The second waste conveying device 53 is also a fan-shaped nozzle. Alternatively, the second waste conveying device 53 can also be a scraper, scraper, brush, or similar component, or it can also include multiple nozzles. The second waste conveying device 53 has a slit-shaped nozzle 54, which is designed to generate a fan-shaped jet stream 55 of cleaning fluid and / or fresh water F. In the illustrated embodiment, the nozzles 51 and 54 are oriented at an angle relative to each other, but they can also be aligned parallel to each other. The jet stream 55 of the second waste conveying device 53 is oriented in the opposite direction to the radial direction R and at an angle relative to the surface filter 18. The jet streams 52 and 55 of the two waste conveying devices 50 and 53 can cross each other, but this is not necessary. Alternatively, two waste conveying devices 50 and 53 can be provided, or only one waste conveying device (not shown) can be provided. In addition, more than two waste conveying devices 50 and 53 can also be provided. The second waste conveying device 53 may also be referred to as the second filter cleaning nozzle. The ultimate key point is that the waste conveying device or multiple waste conveying devices are designed in terms of quantity, arrangement and structural design to clean at least the main part of the surface of the surface filter 18 facing the cleaning chamber 2, preferably the entire surface.

[0077] The function of the filtration system 17 will be described below. During operation of the household dishwasher 1, the spray device 28 rotates about the pivot 31 in the rotation direction D. The rotation direction D can be clockwise. To drive the spray device 28, a drive nozzle can be provided, from which cleaning liquid and / or fresh water F flows, causing the spray device 28 to move in the rotation direction D. In this case, the spray device 28 is either backwash driven or passively driven. However, the spray device 28 can also be actively driven. In this case, a drive element, particularly in the form of a motor, is provided to drive the spray device 28.

[0078] Dirt 56 may be present on the bottom 7 and / or the surface filter 18 and / or the middle component 74 of the filtration system 17. Dirt 56 may include food residue in solid and liquid forms. The spray device 28 rotates in the direction of rotation D, and the waste conveying devices 50, 53 are in operation and loaded with cleaning fluid and / or fresh water F, thereby forming jet streams 52, 55. With the help of jet stream 55, dirt 56 is washed radially from the bottom 7 onto the surface filter 18 in the opposite direction to the radial direction R. Jet stream 52 washes dirt 56 in the direction of rotation D toward the inlet opening 44, where a coarse filter 45 is provided.

[0079] The jet stream 52 flushes dirt 56 through the coarse filter 45 into the inlet opening 44 of the unclean area 20. Larger portions of the dirt 56 remain on the coarse filter 45 and can be manually removed. Subsequently, the dirt 56, along with cleaning fluid and / or fresh water F, is introduced into the unclean area 20 of the pump pit 16 through the inlet opening 44, thus forming a coarse filter volume flow VG of cleaning fluid and / or fresh water F. In other words, all dirt 56 entering the pump pit 16 through the inlet opening 44, as well as all cleaning fluid and / or fresh water F, is introduced into the unclean area 20. Simultaneously, the cleaning fluid and / or fresh water F can also pass through the surface filter 18 into the clean area 21, thus forming a surface filter volume flow VL.

[0080] There is no direct fluid communication between the inlet opening 44 and the clean area 21. However, the separator filter 19 has a fluid-permeable separator filter section 49 in the area separating the unclean area 20 from the clean area 21. The cleaning solution and / or fresh water F can reach the clean area 21 after passing through the separator filter section 49, thereby forming a separator filter volumetric flow VF. The cleaning solution and / or fresh water F that has passed through the surface filter 18 is only introduced into the clean area 21.

[0081] While the circulation pump 26 is running, the cleaning fluid and / or fresh water entering the clean area 21 via the surface filter 18 is distributed to the spray devices 28, 29, and 30 via the distributor 27 and supply lines 34, 35, and 36. However, the cleaning fluid and / or fresh water from the unclean area 20 also enters the clean area 21 first via the separator filter section 49 of the separator filter 19, and thus enters the hydraulic circuit. During this process, dirt 56 in the cleaning fluid and / or fresh water F of the unclean area 20 is filtered out of the cleaning fluid and / or fresh water F by means of the separator filter section 49. The separator filter section 49 can therefore be clogged by components of the dirt 56. To clean the separator filter section 49, the circulation pump 26 is turned off and the drain pump 23 is turned on.

[0082] The drain pump 23 now draws the cleaning fluid and / or fresh water F, along with the dirt 56 therein, out of the unclean area 20. Simultaneously, the suction generated by the drain pump 23 in the unclean area 20 also draws the cleaning fluid and / or fresh water from the clean area 21 into the unclean area 20 through the separator filter section 49 of the separator filter 19, thereby rinsing the separator filter section 49. The dirt 56 detached from the separator filter section 49 during this process is then removed by the drain pump 23. Advantageously, manual cleaning of the separator filter 19, especially the separator filter section 49, is unnecessary. The separator filter 19 is therefore self-cleaning.

[0083] Figure 6 Another schematic top view of the filtration system 17 is shown. Figure 7 A schematic view of the separator filter 19 is shown.

[0084] The surface filter 18 of the filtration system 17 forms a surface filter area A1 that is permeable by fluid. Figure 6 The area is indicated by a shading line. The surface filter area A1 is preferably not a closed loop, but rather consists of a dirty area covered by a portion 46 (in...). Figure 6 The annular segments (represented by double diagonal shading) are supplemented so that the surface filter 18 and the unclean area coverage portion together form an annular shape; or in the unclean area coverage portion 46, as shown in the figure... Figure 5 When the surface filter 18 is extended at an angle relative to the surface filter 18, when projected from a vertically upward perspective, the surface filter 18 and the projection of the unclean area covering portion 46 form a closed loop.

[0085] The unclean area cover 46 may be part of the separator filter 19 or the surface filter 18, or it may be a separate unit. The unclean area cover 46 is permeable by fluid and therefore has an opening 47 and a plurality of through holes 48. The cleaning fluid and / or fresh water F passing through the opening 47 of the unclean area cover 46 is introduced into the unclean area 20 as part of the coarse filtration volume flow VG.

[0086] Figure 7 The diagram specifically shows only the separator filter section 49 of the separator filter 19. The separator filter section 49 is permeable to fluid and has a separator filter area A2.

[0087] It is hereby stipulated that the lower limit of the area ratio of the surface filter area A1 to the area of ​​the separator filter A2 is greater than or equal to 5:1. The possible upper limit of this area ratio can be less than or equal to 30:1, 20:1, 15:1, 10:1, 8:1, or 6:1. Therefore, it is preferred that the following condition is met: A1 : A2≥5 : 1.

[0088] And it can also satisfy: A1 : A2≤30 : 1.

[0089] By adjusting the ratio between the two filter areas A1 and A2, optimal filtration can be achieved at the highest possible volumetric flow rate of cleaning fluid and / or fresh water F. Furthermore, the operation of the drain pump 23 enhances the flushing of the separator filter area A2. This simplifies and improves the cleaning of the separator filter 19.

[0090] Figure 8 A schematic cross-sectional view showing another embodiment of the filtration system 17A is shown. Figure 9 Showing the use of Figure 8 An improved schematic diagram of one embodiment of the separator filter 19A of the filtration system 17A. Reference will also be made to... Figure 8 and Figure 9 Please provide an explanation.

[0091] Unlike the separator filter 19 of the filtration system 17, the separator filter 19A of the filtration system 17A is not plate-shaped or planar, but cylindrical. The separator filter 19A can be configured as a rotationally symmetrical structure relative to the axis of rotation 31. The separator filter 19A is housed within the pump pit 16, which divides it into an unclean area 20 (located inside the separator filter 19A) and a clean area 21 (located outside the separator filter 19A). A drain pump 23 is connected to the unclean area 20. A circulation pump 26 is connected to the clean area 21.

[0092] The separator filter 19A has a separator filter section 57 that is permeable by fluid. The separator filter section 57 has an opening 58 and a plurality of through holes 59 (partially shown). Figure 8 and Figure 9 In this orientation, the separator filter section 57 is disposed at the lower end of the separator filter 19A. That is, the separator filter section 57 is disposed at the end section of the separator filter 19A away from the surface filter 18. The separator filter section 57 has a height h57.

[0093] The separator filter 19A also includes a non-fluid-permeable outer casing section 60. The outer casing section 60 is disposed immediately adjacent to the separator filter section 57. The outer casing section 60 and the separator filter section 57 together have a height h60. The height h57 of the separator filter section 57 is at most 25% of the height h60.

[0094] The outer casing section 60 is connected to the coarse filter 61. The outer casing section 60 is therefore arranged between the separator filter section 57 and the coarse filter 61. The coarse filter 61 includes a plurality of through holes 62.

[0095] When the filtration system 17A is running, the cleaning solution and / or fresh water F passes through the surface filter 18 into the clean area 21. Simultaneously, the cleaning solution and / or fresh water F passes through the coarse filter 61 into the unclean area 20. When the circulation pump 26 is running, the cleaning solution and / or fresh water F enters the clean area 21 from the unclean area 20 via the separator filter section 57, where it is filtered. The separator filter section 57 thus becomes clogged with contaminants.

[0096] To clean the separator filter section 57, the circulation pump 26 is turned off and the drain pump 23 is turned on. Cleaning fluid and / or fresh water F then flow from the clean area 21 through the separator filter section 57 into the unclean area 20, thereby rinsing the separator filter section 57. Because the area of ​​the separator filter section 57 is as small as possible, improved flow dynamics can be achieved in this section, resulting in better self-cleaning performance for the separator filter 19A.

[0097] The advantages of locating the filter section 57 of the separator filter 19A away from the end section of the surface filter 18, as described above, are illustrated using a filtration system 17A with a cylindrical separator filter 19A as an example, but are equally applicable to the same extent. Figures 2 to 7 An embodiment of the plate-shaped or planar separator filter 17 is shown.

[0098] Figure 10 Another schematic top view of the filtration system 17 is shown.

[0099] Figure 10 Surface filter 18 is not shown. Only the separator filter section 49 is shown in separator filter 19, which divides pump pit 16 into unclean area 20 and clean area 21 at least in a partial area. Pump pit 16 is schematically cylindrical, with unclean area 20 and clean area 21 being the same size. However, pump pit 16 can also have any geometry. Unclean area 20 and clean area 21 can also be different sizes.

[0100] Particularly preferably, the drain pump 23 and the circulation pump 26 are arranged such that the pump pit 16 is located between the drain pump 23 and the circulation pump 26. This arrangement is not mandatory, but allows the flow of cleaning fluid and / or fresh water F to proceed either from the unclean area 20 through the separator filter section 49 into the clean area 21, or from the clean area 21 through the separator filter section 49 into the unclean area 20, and the flow direction is oriented perpendicularly or approximately perpendicularly to the separator filter section 49.

[0101] Especially when cleaning the filter section 49 of the separator filter (turn off the circulation pump 26 and turn on the drain pump 23), the suction of the drain pump 23 will be at the aforementioned separator filter area A2 ( Figure 7 It acts evenly on the surface. Figure 10The designation 63 indicates the flow of cleaning fluid and / or fresh water F. Flow 63 is oriented vertically relative to the filter section 49 or the filter area A2 of the separator filter. Due to the high dynamic effect at the filter area A2 of the separator filter, the separator filter 19 (especially the filter section 49) achieves self-cleaning as uniformly as possible.

[0102] Figure 11 and Figure 12 Another schematic cross-sectional view of the filtration system 17 is shown. Figure 13 and Figure 14 Another schematic top view of the separator filter 19 (especially the separator filter section 49 of the separator filter 19) is shown. See also the following... Figures 11 to 14 Please provide an explanation.

[0103] The function of the separator filter 19 or separator filter section 49 is to separate the unclean area 20 from the clean area 21, so that dirt particles 64 of a certain size are retained in the unclean area 20. At the same time, the unclean area 20 and the clean area 21 must be able to exchange cleaning fluid and / or fresh water F (bidirectionally). The coarse filtration volumetric flow VG flows into the unclean area 20 through the inlet opening 44. Figure 5 The cleaning solution and / or fresh water F must flow into the clean area 21 through the separator filter section 49 at the defined filtration level. Even if the separator filter section 49 is partially blocked (e.g., blocked by dirt particles 64), the exchange of the cleaning solution and / or fresh water F must still be maintained.

[0104] To consistently achieve the aforementioned exchange, the separator filter section 49 has a first opening region 65 with a first opening portion 66. The first opening portion 66 is formed by a plurality of through holes 67, which may be circular. Each through hole 67 has a cross-sectional area A67, schematically shaded. The first opening region 65 has a height h65.

[0105] Furthermore, the filter section 49 of the separator filter has a second opening region 68, which is arranged above the first opening region 65 when viewed along the height direction y. The second opening region 68 has a second opening portion 69. The second opening portion 69 is formed by a plurality of through holes 70, which may be circular. Each through hole 70 has a cross-sectional area A70, shown in shaded area. The cross-sectional area A70 is preferably at least as large as the cross-sectional area A67. The through holes 70 may have a diameter larger than that of the through holes 67. The second opening region 68 has a height h68. The total area of ​​all the through holes 67 in the first opening portion 66 is comparable to the total area of ​​all the through holes 70 in the second opening portion 69. Therefore, the difference between the total area of ​​all the through holes 67 in the first opening portion 66 and the total area of ​​all the through holes 70 in the second opening portion 69 should not exceed 30%, preferably not more than 20%, more preferably not more than 10%, and particularly preferably not more than 5%.

[0106] Any number of opening regions 65 and 68 can be provided. Opening regions 65 and 68 can be directly adjacent to each other. Optionally, a non-opening region 71 can be provided between the opening regions 65 and 68, which cannot be penetrated by fluid. However, region 71 is not necessarily non-opening; region 71 may also have an opening portion, which may have a through hole 67 larger in diameter and / or cross-sectional area than the through hole 70 of the first opening portion 66 and smaller than the through hole 70 of the second opening portion 69.

[0107] During normal operation, the exchange of cleaning fluid and / or fresh water F occurs through the first orifice region 65. In cases of high dirt load or gradual clogging of the first orifice region 65, the exchange also occurs at least partially through the second orifice region 68, thus maintaining washing operation without significantly reducing washing performance. Without the second orifice region 68, the unclean area 20 may overflow, and dirt particles 64 of all sizes will enter the hydraulic circuit 37, resulting in significantly worse washing performance.

[0108] Figure 11 and Figure 13 In the figure, 72 indicates the level of cleaning fluid and / or fresh water F in pump pit 16 during normal operation. Figure 12 and Figure 14 In the diagram, level 73 indicates the liquid level under high contaminant load. Level 73 is higher than level 72. Levels 72 and 73 do not exist simultaneously, but rather represent two different states caused by two different contaminant loads.

[0109] Figure 11 and Figure 12 Check valve 93 is also shown. Check valve 93 is part of separator filter 19 and is preferably arranged at the end section of separator filter 19 opposite to surface filter 18. The arrangement and orientation of check valve 93 is such that when circulation pump 26 is running (i.e., cleaning fluid and / or fresh water F flows from unclean area 20 to clean area 21), check valve 93 is closed and / or in a closed state. Figure 11 The diagram shows that check valve 93 is in the closed state; in this operating state, no flow can pass through check valve 93.

[0110] In addition, when the drain pump 23 is running, the check valve 93 is open or remains open. Figure 12 The check valve 93 is shown in the open position. Cleaning fluid and / or fresh water F can flow from clean area 21 through check valve 93 into unclean area 20 and be pumped out by drain pump 23. This is particularly advantageous when the filter section 49 of the separator filter (especially on its side facing clean area 21) is clogged with contaminant particles 94, allowing for the drainage of cleaning fluid and / or fresh water F. The contaminant particles 94 in clean area 21 are smaller than the contaminant particles 64 in unclean area 20.

[0111] The check valve 93 is positioned at the end section of the separator filter 19 away from the surface filter 18, specifically close to the corresponding discharge port 22 of the drain pump 23. This minimizes the area of ​​the separator filter 19 and / or separator filter section 49 affected by the flow from the check valve 93 during drain pump 23 operation, and ensures that even when the check valve 93 is open, dirt particles 94 are removed from the separator filter section 49, thereby achieving cleaning of the separator filter 19.

[0112] Figure 15 Another schematic cross-sectional view of the filtration system 17 is shown.

[0113] Figure 15 Pump pit 16 and separator filter 19 are not shown. A central component 74 of the filtration system 17 is arranged inside annular or segmental surface filter 18, and spray device 28 is rotatably supported on the central component 74 about a pivot 31. However, spray device 28 may also be supported on other components in this area, particularly on pump pit 16. The central component 74 is conical or pyramidal in shape and includes a central filtration section 75 permeable by fluid. In the illustrated embodiment, the central component 74 also includes a support pin 76 disposed on the upper side of the central filtration section 75, on which spray device 28 is rotatably supported about a pivot 31. If spray device 75 is supported in other ways, the central component 74 does not have support pin 76.

[0114] The middle component 74 and the middle filter section 75 are either not covered or only partially covered by the jet streams 52 and 55, and therefore cannot be cleaned by the jet streams 52 and 55. However, the middle filter section 75 should not be contaminated on either side (i.e., the outer side facing the cleaning chamber 2 and the inner side facing the pump pit 16). Furthermore, the cleaning fluid and / or fresh water F should be returned to the pump pit 16 as quickly as possible to save on the number of cycles, and should have an venting function without negatively impacting the washing performance. To achieve venting while cleaning the middle filter section 75, the middle filter section 75 is designed with a perforated structure.

[0115] Figure 16 A schematic partial cross-sectional view of the central filter section 75 is shown.

[0116] The central filtration section 75 has a wall 77 extending around a pivot 31, the wall having an outer side 78 and an inner side 79 opposite to the outer side 78. As previously described, the central filtration section 75 has a perforated structure and includes an opening 80 with a plurality of through holes 81 penetrating the wall 77. The through holes 81 may have a frustoconical geometry and gradually taper from the inner side 79 toward the outer side 78. The wall 77 is inclined relative to the pivot 31 at an angle α. The angle α may be, for example, 4° to 85°.

[0117] The conical / pyramidal structure of the middle component 74 enables rapid and directional delivery of cleaning fluid and / or fresh water F, particularly accelerating the cleaning fluid and / or fresh water F, and ensuring that when contaminant particles 64 are larger than the through holes 81 of the opening portion 80, the contaminant particles 64 are transported along the outer side 78 of the wall 77 towards the surface filter 18. Figure 15 As indicated by arrow 82. Thus, all contaminant particles 64 larger than those in the through-holes 81 of the opening 80 are directionally conveyed to the surface filter 18, and subsequently transported to the inlet opening 44 by means of contaminant conveying devices 50 and 53. Figure 4 This enables rapid reflux of cleaning fluid and / or fresh water F, as well as rapid transport of contaminants.

[0118] Cleaning fluid and / or fresh water F flows through the opening 80 of the central filtration section 75 and through the central component 74. Therefore, some of the cleaning fluid and / or fresh water F also flows along the inner side 79 of the central filtration section 75, thereby actively cleaning and keeping the inner side 79 clean; otherwise, the inner side 79 might be contaminated by splashing water and foam 83. In particular, dirt particles 64 smaller than those in the through-holes 81 of the opening 80 can be washed away from the inner side, as indicated by arrow 84. For example, dirt particles 64 can be carried to the inner side 79 with foam 83, as indicated by arrow 85. This avoids contamination of the inner side 79.

[0119] The opening 80 should be selected such that contaminant particles 64 entering the subsequent hydraulic circuit 37 will not cause loss or damage to any function, thus not affecting washing performance. Furthermore, the opening 80 allows venting of the internal space 86 enclosed by the central filter section 75, expelling any air that may accumulate below the closed central filter section. Venting of the internal space 86 is indicated by arrows 87 and 88. As previously mentioned, the opening 80 (especially the through-hole 81) is tapered, such that the diameter of the through-hole 81 at the outer side 78 is smaller than its diameter at the inner side 79.

[0120] Figure 17 Another schematic top view of the separator filter 19 is shown. Figure 18 Show along Figure 17 A schematic cross-sectional view of the separator filter 19 along the central section line XVIII–XVIII. See also the following... Figure 17 and Figure 18 Please provide an explanation.

[0121] Figure 17 and Figure 18 The image shows only the separator filter section 49 of the separator filter 19. As previously described, the separator filter section 49 has a first opening region 65 with a first opening portion 67 and a second opening region 68 with a second opening portion 69.

[0122] The first opening area 65 is at least partially covered by a protective cover 89, which is connected to area 71 of the separator filter section 49 via a connecting section 90. The protective cover 89 and the first opening area 65 are spaced apart by a distance a. The distance a can be, for example, 1 to 20 mm. The protective cover 89 is not permeable by fluid, or at least its fluid permeability is lower than that of the separator filter section 49. The protective cover 89 is arranged within the clean area 21 of the pump pit 16.

[0123] The protective cover 89 reduces the filtration load caused by dirt in the first opening area 65 on the side of the drain pump 23 during circulation. The suction or volumetric flow in the direction of the circulation pump 26 is weakened by the first opening area 65, thereby preventing or at least reducing the embedment of dirt particles 64 into the first opening area 65.

[0124] The protective cover 89 reduces the suction or volumetric flow of the first opening region 65. The protective cover 89 creates hydraulic resistance. The protective cover 89 is preferably located within the clean area 21 on the suction side of the circulating pump 26 and directly in front of the first opening region 65 to reduce the volumetric flow or velocity of the cleaning fluid and / or fresh water F through the first opening region 65.

[0125] Due to the slower flow, less contaminants enter, and the contaminant particles 64 are drawn in and / or embedded less in the first opening area 66, making them easier to remove from the separator filter section 49 during the drainage of cleaning fluid and / or fresh water F. The reverse flow during drainage easily removes contaminant particles 64 adhering to the separator filter section 49, ensuring the permeability of the separator filter section 49.

[0126] Therefore, the hydraulic resistance generated by the protective cover 89 reduces the dirt load on the filter section 49 of the separator filter, making it easier to remove dirt particles 64 during the pumping process. When pumping out the cleaning fluid and / or fresh water F, the protective cover 89 is surrounded by fluid in a manner that creates the largest possible turbulence around it and generates the strongest possible scouring effect on the filter section 49 of the separator filter (especially the first opening area 65), thereby ensuring the function of the separator filter 19 throughout the entire life cycle of the household dishwasher 1.

[0127] Figure 19 Another schematic cross-sectional view of a household dishwasher 1 is shown. Figure 20 A schematic block diagram illustrating a method for operating a household dishwasher 1 is shown. Reference is also made below. Figure 19 and Figure 20 Please provide an explanation.

[0128] To wash the item 39, detergent 91 is required. The detergent can be in powder, gel, or tablet form and is added to the hydraulic circuit 37 via a detergent dispensing device. When the detergent cap of the detergent dispensing device is opened, detergent 91 enters the washing chamber 4. If detergent 91 is a tablet, it either falls into a predetermined dissolution location (especially a so-called tablet tray) or falls irregularly into the washing chamber 4, where it dissolves in the refluxed cleaning solution and / or fresh water F and is effectively distributed onto the item 39.

[0129] If the aforementioned annular surface filter 18 and the dirt conveying devices 50 and 53 for actively cleaning the surface filter 18 are provided, the detergent 91 (especially when in powder form) may be flushed into the inlet opening 44 without additional measures. Figure 4 The detergent 91 is then pumped out of the unclean area 20 by the drain pump 23, thus preventing the detergent 91 from cleaning. The consequence is a significant decrease in washing performance because the concentration of cleaning enzymes acting on the cleaned item 39 is lower. This must be avoided by taking the additional measures described below.

[0130] When the detergent dispensing device is triggered, the active waste transport via waste transport devices 50 and 53 (which delivers undesirable detergent 91 to unclean areas 20) is at least partially deactivated and rendered ineffective. Various solutions are possible.

[0131] First, during the first time period S1 (from the opening of the detergent dispensing device to the dissolution of detergent 91), the spray device 28 is not activated, meaning that the spray device 28 is not supplied with cleaning liquid and / or fresh water F. This avoids or significantly reduces the undesirable delivery of detergent 91 to unclean areas 20. During the dissolution of detergent 91, all other spray devices 29 and 30, except for spray device 28, can be activated.

[0132] Second, the detergent 91 can be supplied to the spray device 28 at a lower spray pressure before it dissolves. This eliminates the need for the spray device 28 to rotate, thereby eliminating active dirt transport. The detergent 91 will therefore not be undesirably transported to the unclean area 20.

[0133] Third, during washing operation, the level 92 of the cleaning fluid and / or fresh water F can be raised (or the amount of bath water in the washing space 4 can be increased) to exceed the surface filter 18, thereby making active filtration cleaning and dirt transport impossible. The detergent 91 can be dissolved in the cleaning fluid and / or fresh water F and remain in the hydraulic circuit 37.

[0134] Fourth, dynamic waste conveying devices 50 and 53 that only activate when a specific pressure is reached can be used. During the triggering of the detergent dispensing device or the dissolution of detergent 91, the spray pressure is low enough to keep the waste conveying devices 50 and 53 inactive, thus neither conveying waste nor delivering detergent 91 to the unclean area 20. Only after the detergent 91 has dissolved, during the second time period S2, is a higher spray pressure supplied to the waste conveying devices 50 and 53, causing them to spray cleaning fluid and / or fresh water F. The above methods can also be combined.

[0135] By implementing the above measures, the detergent 91 can be prevented from unintentionally entering the unclean area 20, thereby ensuring the effectiveness and washing performance of the detergent 91. The detergent 91 is reliably retained in the hydraulic circuit 37.

[0136] Although the present invention has been described in conjunction with embodiments, various modifications are still possible.

[0137] Reference numbers used: 1. Household dishwasher 2. Clean the cavity 3 doors 4. Washing space 5 Pivot axis 6 Loading opening 7. Bottom 8 Top 9. Rear wall 10 Sidewalls 11 Sidewalls 12. Tableware Storage Department 13. Tableware Storage Department 14. Tableware Storage Department 15. Base bearing components 16 Pump pit 17 Filtration System 17A Filtration System 18 Surface Filter 19. Separating Filter 19A Separator Filter 20 Unclean areas 21 Clean Area 22 Emission outlets 23 Drainage Pump 24 Drainage pipes 25 Emission outlets 26 Circulation Pump 27 Water distributor 28 Spraying device 29 Spraying device 30 Spraying device 31 pivot 32 pivots 33 pivot 34 Supply pipeline 35 Supply pipeline 36 Supply pipeline 37 Hydraulic Circuit 38 controllers 39 Cleaning materials 40 Outer edge 41 Inner edge 42. Opening section 43 Through hole 44 Enter the opening 45 Coarse Filter 46. ​​Covered areas of uncleanliness 47. Opening section 48 Through holes 49. Separated filter section 50 Waste conveying device 51 Nozzle 52 Jet Stream 53 Waste conveying device 54 nozzles 55 Jet Stream 56 Dirt 57. Separated filter section 58. Opening section 59 Through Hole 60 outer cover section 61 Coarse Filter 62 Through Holes 63 Streams 64. Dirt particles 65 Opening area 66. Opening section 67 Through hole 68 Opening area 69. Opening section 70 Through Hole Area 71 72 liquid level 73 Liquid Level 74 Support cone 75 conical segment 76 Support pins 77 Wall 78 Outer side 79 Inner side 80 Opening section 81 Through Hole 82 arrows 83 Foam 84 arrows 85 arrow 86 Interior Space 87 arrows 88 arrows 89 Protective Shield 90 Connecting Section 91 Detergent 92 liquid level 93 Check valve 94. Dirt particles a Spacing A. Pull out the direction A1 Surface filter area A2 Separator Filter Area A67 Cross-sectional area A70 cross-sectional area D Rotation direction E. Push direction F Cleaning solution and / or fresh water g direction of gravity h57 height h60 height h65 height h68 height R radial direction S1 time period S2 time period VF Separator Filter Volume Flow VG coarse filter volumetric flow VL surface filter volume flow xx direction yy direction zz direction α is the tilt angle.

Claims

1. A household dishwasher (1) comprising: a washing chamber (2) for receiving laundry (39); a pump pit (16) disposed on the washing chamber (2); a filtration system (17) having a surface filter (18) that at least partially covers the pump pit (16); a waste conveying device (50, 53); and a controller (38), wherein, The waste conveying devices (50, 53) are designed to clean the surface of the surface filter (18) facing the cleaning chamber (2) and to selectively move dirt (56) deposited on the surface filter (18) into the unclean area (20) of the pump pit (16) during the cleaning process, wherein a drain pump (23) is connected to the lower end of the unclean area (20), and the controller (38) is designed to control the waste conveying devices (50, 53) to be deactivated during a first period (S1) after detergent (91) is added to the cleaning chamber (2), thereby preventing the waste conveying devices (50, 53) from inputting the detergent (91) introduced into the cleaning chamber (2) into the unclean area (20) of the pump pit (16).

2. The household dishwasher according to claim 1, characterized in that, The filtration system (17) has a partition filter (19) that divides the pump pit (16) into the unclean area (20) and the clean area (21).

3. The household dishwasher according to claim 2, characterized in that, A circulation pump (26) is connected to the clean area (21).

4. The household dishwasher according to any one of claims 1 to 3, characterized in that, At least one spray device (28, 29, 30) is provided for loading cleaning fluid and / or fresh water onto the cleaned material, and the waste conveying device (50, 53) is preferably attached to the spray device (28, 29, 30).

5. The household dishwasher according to claim 4, characterized in that, The spraying devices (28, 29, 30) are designed as spray arms.

6. The household dishwasher according to any one of claims 1 to 5, characterized in that, The waste conveying device (50, 53) includes at least one nozzle.

7. The household dishwasher according to claim 6, characterized in that, The waste conveying devices (50, 53) are designed to generate jet streams (52, 55) that are oriented at an angle relative to the surface filter (18).

8. The household dishwasher according to any one of claims 4 to 7, characterized in that, The controller (38) is designed to control the spray devices (28, 29, 30) and / or the waste conveying devices (50, 53) so that they are not subjected to pressure during the first time period (S1).

9. The household dishwasher according to any one of claims 4 to 7, characterized in that, The controller (38) is designed to control the spray devices (28, 29, 30) and / or the waste conveying devices (50, 53) to be loaded with a pressure less than a predetermined pressure threshold required to activate the waste conveying devices (50, 53) during the first time period (S1).

10. The household dishwasher according to claim 9, characterized in that, The controller (38) is designed to control such that the spray devices (28, 29, 30) and / or the waste conveying devices (50, 53) are subjected to a pressure less than the predetermined pressure threshold during the first time period (S1), and the spray devices (28, 29, 30) are kept in a fixed position, especially kept rotated.

11. The household dishwasher according to any one of claims 1 to 10, characterized in that, The waste conveying device has a dynamic nozzle that sprays cleaning fluid and / or fresh water only when the pressure is above a predetermined threshold.

12. The household dishwasher according to any one of claims 9 to 11, characterized in that, The controller (38) is designed to control the spray devices (28, 29, 30) and / or the waste conveying devices (50, 53) to be subjected to at least one pressure above a predetermined pressure threshold during a second period (S2) after the detergent (91) is added to the cleaning chamber (2).

13. The household dishwasher according to claim 12, characterized in that, The household dishwasher has other spray devices (28, 29, 30) in addition to the spray devices (28, 29, 30), wherein the controller (38) is designed to control such that the other spray devices (28, 29, 30) are subjected to at least one pressure higher than the predetermined pressure threshold during the first time period (S1) and during the second time period (S2).

14. The household dishwasher according to any one of claims 4 to 13, characterized in that, The controller (38) is designed to control such that during the first time period (S1), the level (92) of the cleaning fluid and / or fresh water (F) rises and / or the amount of bath water in the cleaning chamber (4) rises above the surface filter (18).

15. A method for operating a household dishwasher (1), the household dishwasher having: a washing chamber (2) for receiving laundry (39); a pump pit (16) disposed on the washing chamber (2); a filtration system (17) having a surface filter (18) that at least partially covers the pump pit (16); and a waste conveying device (50, 53), wherein, The waste conveying devices (50, 53) are designed to clean the surface of the surface filter (18) facing the cleaning chamber (2) and to selectively move dirt (56) deposited on the surface filter (18) into the unclean area (20) of the pump pit (16) during the cleaning process, wherein the drain pump (23) is connected to the lower end of the unclean area (20); and the waste conveying devices (50, 53) are deactivated during a first period (S1) after detergent (91) is added to the cleaning chamber (2) to prevent the waste conveying devices (50, 53) from inputting the detergent (91) introduced into the cleaning chamber (2) into the unclean area (20) of the pump pit (16).

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