A sink, a dishwasher with a liquid level detection function, and a liquid level control method

Abstract

The present invention relates to the technical field related to dishwashers, and its purpose is to provide a sink, a dishwasher and a liquid level control method with a liquid level detection function. This sink has a simple structure and a relatively low manufacturing cost, can detect the liquid level height in real time, quickly judge the water inlet and drainage conditions, reduce the program waiting time, and optimize the user experience. The sink with a liquid level detection function includes a first sink and a second sink that are interconnected, and a liquid level detection mechanism is provided in the first sink. The present invention solves the problem that in the prior art, a liquid level detection element is arranged in the cleaning sink of the dishwasher, occupying the internal space of the cleaning sink, resulting in a reduction in the cleaning capacity of the dishwasher and being unable to meet the actual use requirements.

Description

Technical Field

[0001] The present invention relates to the technical field related to dishwashers, and particularly to a sink, a dishwasher and a liquid level control method with a liquid level detection function. Background Art

[0002] Currently, dishwashers have become one of the most commonly used household appliances. Among them, the most widely used types of dishwashers include sink dishwashers, built-in dishwashers, etc. Both sink dishwashers and built-in dishwashers have a cleaning sink that can intake and drain water, and the cleaning process of items such as bowls and dishes is carried out in this cleaning sink. Specifically, during the operation of the dishwasher, it is necessary to first store water in the cleaning sink of the dishwasher, and the liquid level in the cleaning sink must reach the water intake requirement to start cleaning. Similarly, after the cleaning process is completed, the cleaning sink needs to be drained, and the drainage stops when the liquid level in the cleaning sink reaches the drainage requirement. Therefore, during both the water intake process and the drainage process of the cleaning sink, it is necessary to detect the liquid level in real time to determine whether the water intake and drainage volumes in the cleaning sink meet the requirements.

[0003] The existing method for detecting the liquid level in the dishwasher sink is to set multiple liquid level detection elements on the side wall and bottom surface of the cleaning sink to meet the liquid level detection requirements from multiple angles. However, these liquid level detection elements are directly arranged inside the cleaning sink of the dishwasher. During the operation of the dishwasher, bowls, dishes and other items need to be placed in the cleaning sink, and the capacity of the cleaning sink is fixed. The liquid level detection elements set on the side wall and bottom surface of the cleaning sink will inevitably occupy its internal space, affecting the cleaning capacity of the cleaning sink, resulting in a reduction in the cleaning capacity of the dishwasher and unable to meet the actual use requirements. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the liquid level detection elements are arranged inside the cleaning sink of the dishwasher, occupying the internal space of the cleaning sink, resulting in a reduction in the cleaning capacity of the dishwasher and unable to meet the actual use requirements. Thus, a sink, a dishwasher and a liquid level control method with a liquid level detection function are provided, which do not occupy the internal space of the cleaning sink, do not affect the cleaning capacity, can fully meet the actual use requirements, and have a simple structure and relatively low manufacturing cost.

[0005] To solve the above problems, the present invention provides a sink with a liquid level detection function, including a first sink and a second sink that are interconnected, and a liquid level detection mechanism is arranged in the first sink.

[0006] Optionally, the liquid level detection mechanism includes a liquid level detection element, and the liquid level detection element is arranged at the upper part of the first sink.

[0007] Optionally, the liquid level detection element is a phase-type laser distance measuring sensor and is arranged at the top of the first water tank. The liquid level detection mechanism further includes a laser signal reflection buoy, which is suspended in the first water tank. The size of the laser signal reflection buoy is larger than the diameter of the communication pipe between the first water tank and the second water tank.

[0008] Optionally, a flow control element is arranged in the communication pipe.

[0009] Optionally, the flow control element is an electromagnetic valve.

[0010] Optionally, the first water tank and the second water tank are communicated at the bottom.

[0011] A dishwasher includes a housing, and the above-mentioned water tank with a liquid level detection function is arranged in the housing.

[0012] A liquid level control method for the above-mentioned dishwasher includes:

[0013] Start water inlet and turn on the liquid level detection mechanism;

[0014] When the current liquid level height is greater than or equal to the preset water inlet liquid level height, stop water inlet;

[0015] Start cleaning;

[0016] After the cleaning is completed, start draining;

[0017] When the current liquid level height is less than or equal to the preset drainage liquid level height, stop draining.

[0018] Optionally, in the step of stopping water inlet when the current liquid level height is greater than or equal to the preset water inlet liquid level height, it further includes the step of closing the liquid level detection mechanism when the current liquid level height is greater than or equal to the preset water inlet liquid level height;

[0019] The step of starting draining after the cleaning is completed further includes the step of turning on the liquid level detection mechanism after the cleaning is completed.

[0020] Optionally, a flow control element is arranged between the first water tank and the second water tank of the dishwasher;

[0021] In the step of starting water inlet and turning on the liquid level detection mechanism, it further includes the step of turning on the flow control element;

[0022] In the step of stopping water inlet when the current liquid level height is greater than or equal to the preset water inlet liquid level height, it further includes the step of closing the flow control element when the current liquid level height is greater than or equal to the preset water inlet liquid level height;

[0023] After the cleaning is completed, the step of starting drainage further includes the step of opening the flow control element after the cleaning is completed.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The sink with a liquid level detection function provided by the present invention includes a first sink and a second sink that are interconnected. The first sink is a detection sink, and the second sink is a cleaning sink. A liquid level detection mechanism is provided in the first sink. Since the first sink and the second sink are interconnected, the liquid level heights of the first sink and the second sink are always the same. Therefore, by detecting the liquid level of the first sink, the liquid level height value of the second sink can be obtained. The liquid level detection mechanism is arranged in the first sink, away from the cleaning sink, without occupying the internal space of the second sink, not affecting the effective cleaning capacity of the dishwasher, and fully meeting the actual use requirements. The above sink design is ingenious, the structure is simple, and the manufacturing cost is relatively low.

[0026] 2. In the sink with a liquid level detection function provided by the present invention, the liquid level detection mechanism includes a liquid level detection element. The number of liquid level detection elements is not limited. For example, one liquid level detection element can be set. The number of liquid level detection elements is small, which will not excessively occupy the pin resources of the integrated circuit, and the subsequent signal processing is relatively simple. Moreover, the liquid level detection element is preferably arranged in the upper part of the first sink, away from the water surface below, and is hardly affected by the cleaning water. Therefore, there is no need to design a complex waterproof structure, thereby ensuring the service life of the liquid level detection element and reducing the equipment cost.

[0027] 3. In the sink with a liquid level detection function provided by the present invention, the liquid level detection element adopts a phase-type laser ranging sensor and is arranged on the top of the first sink. The phase-type laser ranging sensor is used in cooperation with a laser signal reflection buoy for liquid level detection. The laser signal reflection buoy can float up and down as the liquid level rises and falls. The phase-type laser ranging sensor can obtain the liquid level height values of the first sink and the second sink by detecting the distance from the laser signal reflection buoy. This phase-type laser ranging sensor has high measurement accuracy and small error, which can improve the accuracy of liquid level measurement. Moreover, the phase-type laser ranging sensor is far from the water surface and is not easy to get water in, so there is no need to design a complex waterproof structure, which can ensure its service life and reduce the maintenance cost.

[0028] 4. In the sink with a liquid level detection function provided by the present invention, a flow control element is arranged in the connecting pipe between the first sink and the second sink, which can control the on-off of the connecting pipe. When the current liquid level reaches the preset inlet liquid level height, by closing the flow control element, the first sink and the second sink can be isolated, so that the liquid level detection mechanism in the first sink will not be affected by the temperature change during the cleaning process of the second sink, further ensuring the service life and measurement accuracy of the liquid level detection mechanism.

[0029] 5. The sink with a liquid level detection function provided by the present invention preferably has the first sink and the second sink communicating at the bottom position, which can ensure that the liquid levels of the first sink and the second sink are always exactly the same, and further ensure the accuracy of liquid level measurement.

[0030] 6. The dishwasher provided by the present invention has the sink with a liquid level detection function provided by the present invention. It has a relatively simple structure and a low manufacturing cost. It can measure the liquid level height value of the second sink in real time and accurately, so as to quickly judge the water inlet and drainage conditions, reduce the program waiting time, and optimize the user experience.

[0031] 7. The liquid level control method provided by the present invention can accurately measure the liquid level height value in the second sink by using the liquid level detection mechanism in the first sink. The control process is simple, and the liquid level detection mechanism does not occupy too many pin resources of the integrated circuit, and the subsequent signal processing process is also relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 It is a schematic diagram of the sink with a liquid level detection function of the present invention;

[0034] Figure 2 It is a principle flow chart of the liquid level control method of the present invention;

[0035] Figure 3 It is a specific flow chart of the liquid level control method of the present invention.

[0036] Description of the reference numerals:

[0037] 1 - First sink, 2 - Second sink, 3 - Flow control element, 4 - Liquid level detection element, 5 - Laser signal reflection buoy, 6 - Connecting pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] As Figure 1 shown, it is a preferred embodiment of the sink with a liquid level detection function according to the present invention. This kind of sink with a liquid level detection function is applicable to household appliances such as dishwashers. During the water inlet and drainage processes, it can detect the liquid level height value in real time to quickly judge the water inlet and drainage conditions and reduce the program waiting time.

[0043] The sink with a liquid level detection function includes a first sink 1 and a second sink 2. Among them, the first sink 1 is a detection sink, and a liquid level detection mechanism is arranged inside it. The second sink 2 is a cleaning sink for accommodating and cleaning items such as bowls and dishes. The second sink 2 has structures such as a water inlet and a drain outlet. The capacity of the first sink 1 is much smaller than that of the second sink 2, and the first sink 1 and the second sink 2 are interconnected to ensure that the liquid level heights inside the two are the same. Preferably, the first sink 1 and the second sink 2 are connected at the bottom, and a connecting pipe 6 is provided at the bottom of the first sink 1 and the second sink 2. The connecting pipe 6 is suitable for the flow of water. In addition, the second sink 2 also has relevant structures and components that existing dishwasher sinks all have. Since the present invention does not involve these structures and components, they will not be elaborated here.

[0044] Further, in order to control the connection and disconnection of the connecting pipe 6, a flow control element 3 is arranged in the connecting pipe 6 between the first water tank 1 and the second water tank 2. Preferably, the flow control element 3 is a solenoid valve. During the cleaning process, the water in the second water tank 2 will be heated to 70 °C for cleaning needs, and even water vapor will be generated in the second water tank 2. Before the start of the cleaning process, the first water tank 1 and the second water tank 2 are isolated by the flow control element 3, so that the temperature change of the water in the first water tank 1 is small, thereby avoiding the adverse impact of water vapor on the liquid level detection mechanism and ensuring the service life of the liquid level detection mechanism.

[0045] The liquid level detection mechanism includes a liquid level detection element 4. The liquid level detection element 4 is preferably arranged at the upper part of the first water tank 1, so that the liquid level detection element 4 is far away from the water surface below, which can effectively prevent the liquid level detection element 4 from entering water, without the need to set up a complex waterproof structure, further ensuring the service life of the liquid level detection element and reducing the equipment cost.

[0046] Specifically, the liquid level detection element 4 is a phase-type laser ranging sensor, and the phase-type laser ranging sensor is arranged at the top of the first water tank 1. The liquid level detection mechanism further includes a laser signal reflection buoy 5. The laser signal reflection buoy 5 is suspended in the first water tank 1. That is to say, when there is no water in the first water tank 1, the laser signal reflection buoy 5 is located at the bottom surface of the first water tank 1. When the first water tank 1 starts to fill with water, the laser signal reflection buoy 5 is affected by the buoyancy force and floats up with the rise of the liquid level. Similarly, when the first water tank 1 starts to drain water, the laser signal reflection buoy 5 is affected by the buoyancy force and sinks with the drop of the liquid level. That is, the vertical position of the laser signal reflection buoy 5 directly reflects the liquid level height of the first water tank 1 and the second water tank 2 (the liquid level heights of the first water tank 1 and the second water tank 2 are kept consistent). The phase-type laser ranging sensor can measure the distance between it and the laser signal reflection buoy 5, and the liquid level height values of the first water tank 1 and the second water tank 2 can be obtained through subsequent analysis. In order to keep the laser signal reflection buoy 5 in the first water tank 1 and not float into the second water tank 2, the size of the laser signal reflection buoy 5 is larger than the diameter of the connecting pipe 6 between the first water tank 1 and the second water tank 2, so that the laser signal reflection buoy 5 cannot enter the second water tank 2 through the connecting pipe 6. This phase-type laser ranging sensor has high measurement accuracy and small error, which can improve the accuracy of liquid level measurement.

[0047] This embodiment also provides a dishwasher, including a housing, and a water tank with a liquid level detection function provided in this embodiment is arranged in the housing. The dishwasher can detect the liquid level height in the second water tank 2 in real time during the water inlet and drainage processes, so as to quickly judge the water inlet and drainage conditions, reduce the program waiting time, and optimize the user experience. Of course, the dishwasher also includes structural components that existing dishwashers all have. Since the present invention does not involve these structural components, they will not be described in detail.

[0048] As Figure 2 shown, the present invention also provides a liquid level control method for a dishwasher, including:

[0049] Step 1: Start water inlet and turn on the liquid level detection mechanism;

[0050] Open the water inlet of the second water tank 2, and water enters the second water tank 2 from this water inlet. Since the first water tank 1 and the second water tank 2 are connected, water will also enter the first water tank 1 at the same time. Turn on the liquid level detection mechanism in the first water tank 1 to detect the liquid level in the first water tank 1 in real time. Since the liquid level heights of the first water tank 1 and the second water tank are the same, the liquid level height value in the second water tank 2 can be obtained.

[0051] Step 2: Stop water inlet when the current liquid level height is greater than or equal to the preset water inlet liquid level height;

[0052] The current liquid level height is h, and the preset water inlet liquid level height is H 进水 , and make a real-time judgment. When h≥H 进水 , the liquid level height in the second water tank 2 meets the cleaning requirement, close the water inlet, and stop water inlet.

[0053] Step 3: Start cleaning;

[0054] Step 4: After cleaning, start draining;

[0055] After cleaning, open the drain port of the second water tank 2, and water flows out from this drain port. Since the first water tank 1 and the second water tank 2 are connected, the water in the first water tank 1 is drained at the same time. Detect the liquid level in the first water tank 1 in real time. Since the liquid level heights of the first water tank 1 and the second water tank are the same, the liquid level height value in the second water tank 2 can be obtained.

[0056] Step 5: Stop draining when the current liquid level height is less than or equal to the preset drain liquid level height.

[0057] The current liquid level height is h, and the preset drain liquid level height is H 排水 , and make a real-time judgment. When h≤H 排水 , the liquid level height in the second water tank 2 meets the emptying requirement, close the drain port, and stop draining.

[0058] The liquid level control method of the present invention can accurately measure the liquid level height value in the second water tank by using the liquid level detection mechanism in the first water tank. The control process is simple, can quickly judge the water inlet and drainage situations, reduce the program waiting time, and optimize the user experience.

[0059] In this embodiment, as Figure 3 shown, the specific process steps of the above liquid level control method include:

[0060] Step 100, start;

[0061] Start the dishwasher by operating the control buttons or the touch control screen of the dishwasher.

[0062] Step 200, water inlet, while turning on the liquid level detection mechanism and the flow control element;

[0063] Open the water inlet of the second water tank 2, and water enters the second water tank 2 through this water inlet. Open the solenoid valve to connect the first water tank 1 and the second water tank 2, and water enters the first water tank 1 through the connecting pipe 6.

[0064] Turn on the phase laser range finder in the first water tank 1, and detect the distance from the phase laser range finder to the laser signal reflection buoy 5 in real time, so as to obtain the liquid level height value in the first water tank 1. Since the liquid level height values of the first water tank 1 and the second water tank are the same, the liquid level height value in the second water tank 2 can also be obtained.

[0065] Step 300, determine whether the current liquid level height h ≥ the preset water inlet liquid level height H 进水 ;

[0066] If h < H 进水 , then continue to let water in;

[0067] If h ≥ H 进水 , then execute the subsequent step 400;

[0068] Among them, the current liquid level height h is the liquid level data measured by the phase laser range finder in real time, and the preset water inlet liquid level height H is the liquid level data preset according to application requirements.

[0069] Step 400, stop water inlet, and turn off the liquid level detection mechanism and the flow control element;

[0070] Close the water inlet to stop water inlet. At the same time, turn off the phase laser range finder and the solenoid valve. During the cleaning process of the second water tank 2, there is no need to detect the liquid level height. Therefore, in order to save energy, turn off the phase laser range finder, and turn off the solenoid valve to isolate the first water tank 1 and the second water tank 2 during the cleaning process, so that the phase laser range finder in the first water tank 1 will not be affected by the temperature change during the cleaning process of the second water tank 2, and ensure the service life and measurement accuracy of the liquid level detection mechanism.

[0071] After the water inlet process is completed, the difference between the actual water inlet volume and the preset water inlet volume can be calculated through the current liquid level height h obtained by the phase laser range finder, so as to prepare for the subsequent control process.

[0072] The difference between the actual water inlet volume and the preset water inlet volume can be obtained through the following formula:

[0073] Difference between actual water inflow and preset water inflow = cross-sectional area of water tank × (H 进水 - h)

[0074] Step 500, start cleaning;

[0075] Clean items such as dishes according to the preset cleaning program.

[0076] Step 600, drain water, and at the same time turn on the liquid level detection mechanism and the flow control element;

[0077] Open the drain outlet of the second water tank 2, and the water drains from the second water tank 2 through this drain outlet. Open the solenoid valve to connect the first water tank 1 and the second water tank 2, and the water in the first water tank 1 drains through the drain outlet of the second water tank 2 via the connecting pipe 6.

[0078] Turn on the phase-type laser rangefinder in the first water tank 1, and detect the distance from the phase-type laser rangefinder to the laser signal reflection buoy 5 in real time, so as to obtain the liquid level height value in the first water tank 1. Since the liquid level height values of the first water tank 1 and the second water tank are the same, the liquid level height value in the second water tank 2 can also be obtained.

[0079] Step 700, determine whether the current liquid level height h ≤ preset drainage liquid level height H 排水 ;

[0080] If h > H 排水 , then continue to drain water;

[0081] If h ≤ H 排水 , then execute the subsequent step 800;

[0082] Among them, the current liquid level height h is the liquid level data measured in real time by the phase-type laser rangefinder, and the preset water inlet liquid level height H 排水 is the liquid level data preset according to application requirements.

[0083] Step 800, stop draining water, and turn off the liquid level detection mechanism and the flow control element;

[0084] Close the drain outlet to stop draining water, and at the same time turn off the phase-type laser rangefinder and the solenoid valve to save energy.

[0085] After the drainage process is completed, the difference between the actual drainage volume and the preset drainage volume can be calculated through the current liquid level height h obtained by the phase-type laser rangefinder, so as to prepare for the subsequent control process.

[0086] The difference between the actual drainage volume and the preset drainage volume can be obtained through the following formula:

[0087] Difference between actual drainage volume and preset drainage volume = cross-sectional area of water tank × (h - H 排水 )

[0088] Step 900, determine whether to clean again;

[0089] If yes, execute step 200;

[0090] If no, end.

[0091] The liquid level control method of this embodiment uses the liquid level detection mechanism arranged in the first water tank to detect the real-time liquid level height of the second water tank (cleaning water tank), can obtain the actual liquid level value of the second water tank in a timely and accurate manner, and the whole control process is simple and efficient.

[0092] In other embodiments, for the water tank of the present invention with a liquid level detection function, when the influence of water temperature on the liquid level detection mechanism is not significant, a flow control element may not be provided, thereby further reducing the equipment cost.

[0093] In other embodiments, the liquid level detection element may also adopt other ranging sensors such as an ultrasonic reflection ranging sensor. Of course, the liquid level detection mechanism may also adopt a liquid level detection sensor with other measurement principles, and the liquid level detection element may also be arranged at a convenient position such as the side wall of the upper part of the first water tank 1. As long as the liquid level detection element is arranged in the upper part of the first water tank 1 and is far away from the water surface below, similarly, the flow control element may also adopt other types of valves, and the purpose of the present invention can also be achieved.

[0094] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A sink with a liquid level detection function, characterized in that: It includes a first water tank (1) and a second water tank (2) that are interconnected, and a liquid level detection mechanism is arranged in the first water tank (1); The liquid level detection mechanism includes a liquid level detection element (4), and the liquid level detection element (4) is arranged at the upper part of the first water tank (1); The liquid level detection element (4) is a phase-type laser ranging sensor and is arranged at the top of the first water tank (1). The liquid level detection mechanism further includes a laser signal reflection buoy (5), and the laser signal reflection buoy (5) is suspended in the first water tank (1). The size of the laser signal reflection buoy (5) is larger than the diameter of the connecting pipe (6) between the first water tank (1) and the second water tank (2); The first water tank (1) and the second water tank (2) are connected at the bottom.

2. The sink with a liquid level detection function according to claim 1, characterized in that: A flow control element (3) is arranged in the connecting pipe (6).

3. The sink with a liquid level detection function according to claim 2, characterized in that: The flow control element (3) is an electromagnetic valve.

4. A dishwasher, comprising a housing, characterized in that: The water tank with liquid level detection function according to any one of claims 1-3 is arranged in the housing.

5. A liquid level control method for the dishwasher according to claim 4 above, characterized in that, It includes: Start to fill water and turn on the liquid level detection mechanism; When the current liquid level height is greater than or equal to the preset water inlet liquid level height, stop filling water; Start cleaning; After the cleaning is completed, start draining water; When the current liquid level height is less than or equal to the preset drainage liquid level height, stop draining water.

6. The liquid level control method according to claim 5, characterized in that: In the step of stopping filling water when the current liquid level height is greater than or equal to the preset water inlet liquid level height, it further includes the step of turning off the liquid level detection mechanism when the current liquid level height is greater than or equal to the preset water inlet liquid level height; The step of starting to drain water after the cleaning is completed further includes the step of turning on the liquid level detection mechanism after the cleaning is completed.

7. The liquid level control method according to claim 6, characterized in that: A flow control element (3) is arranged between the first water tank (1) and the second water tank (2) of the dishwasher; In the step of starting to fill water and turning on the liquid level detection mechanism, it further includes the step of turning on the flow control element (3); In the step of stopping filling water when the current liquid level height is greater than or equal to the preset water inlet liquid level height, it further includes the step of turning off the flow control element (3) when the current liquid level height is greater than or equal to the preset water inlet liquid level height; The step of starting to drain water after the cleaning is completed further includes the step of turning on the flow control element (3) after the cleaning is completed.

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