Control method of washing equipment and washing equipment

Abstract

The invention belongs to the technical field of washing equipment, and discloses a control method of washing equipment and the washing equipment, and the control method of the washing equipment comprises the following steps: S1, after the rinsing stage of a washing program of the washing equipment is finished, detecting the water level in a barrel; s2, if the detected water level is not lower than the calibrated water level, opening a water inlet valve and a drain valve, and forming running water in the barrel; s3, detecting the stain index of the running water by a sensor; and S4, when the detected stain index is kept unchanged within a preset duration, taking the currently detected stain index as a reference value L0. According to the invention, by calibrating the reference value, a user can adjust the washing standard when washing clothes and rinsing clothes according to the water quality of the region where the user is located when washing clothes, so that the clothes can be washed more cleanly and specifically, and the purpose of washing clothes more cleanly and specifically in different regions is achieved. The purpose of efficiently and cleanly washing laundry using washing standards suitable for local water quality is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of washing equipment, and in particular, relates to a control method of washing equipment and the washing equipment. Background Art

[0002] As one of the most widely used household appliances in people's daily life, washing equipment helps people get rid of the trouble of washing clothes and brings great convenience to people. However, with the increasing types and functions of washing equipment, it is more suitable for users' different washing needs. At the same time, the water quality of washing water of users in different regions is different, which leads to different washing effects under the same internal washing standard, which needs to be solved urgently.

[0003] At present, some existing washing equipment systems have preset washing water reference values ​​for comparing and judging the degree of cleanliness. However, China's geographical location varies, and the water quality in each region also varies. Using the preset washing water reference values ​​will result in different degrees of cleanliness for users in different regions, making it difficult to better wash clothes.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a control method and a washing device for a washing device. By detecting the live water formed in the washing tub, the baseline value of the washing water is automatically corrected, thereby avoiding the problem of inadequate cleaning during washing due to the different water quality of washing water in different regions, and achieving the purpose of efficiently cleaning clothes.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] The present invention provides a control method for a washing device, comprising the following steps:

[0008] S1. After the rinsing phase of the washing program is completed, the washing equipment detects the water level in the barrel;

[0009] S2. If the detected water level is not lower than the calibration water level, open the water inlet valve and the drain valve to form running water in the barrel;

[0010] S3, a sensor detects a stain index of the running water;

[0011] S4. When the detected stain index remains unchanged within a preset time period, the currently detected stain index is taken as a reference value L0.

[0012] Furthermore, the washing device executes steps S1 to S4 to update the reference value L0 every predetermined time interval or every time the washing program is run for a preset number of times.

[0013] Further, the washing device sets a cleaning threshold value L1=L0+X, wherein X is a preset value;

[0014] When the washing device runs the washing stage of the washing program, if the stain index detected by the sensor is less than the cleaning threshold, washing continues; if the stain index detected by the sensor is greater than or equal to the cleaning threshold, the washing stage stops immediately.

[0015] Furthermore, the washing device is also provided with a maximum washing time T. In the washing stage, when the running time of the washing stage reaches the maximum washing time T, the washing stage is ended.

[0016] Further, the washing device sets a rinsing threshold value L2=L0+Y, wherein Y is a preset value;

[0017] When the washing device runs the rinsing stage of the washing program, if the stain index detected by the sensor is greater than the rinsing threshold, the next rinse will continue after the current rinse is completed; if the stain index detected by the sensor is less than or equal to the rinsing threshold, the rinsing stage will end after the current rinse is completed.

[0018] Furthermore, the washing device is provided with an upper limit N of the number of rinses. During the rinsing stage, when the number of rinses reaches N times, the rinsing stage ends after the current rinse is completed.

[0019] Furthermore, the washing device is preset with a normal value of the stain index. In step S3, if the detected stain index exceeds the normal value of the stain index, a reminder message is sent.

[0020] The present invention also provides a washing device, wherein the washing device executes the control method of the washing device as described above.

[0021] Furthermore, the washing device is provided with a detection channel, and in steps S2 and S3, the water flow passing through the water inlet valve enters the detection area of ​​the sensor through the detection channel to detect the stain index.

[0022] Furthermore, the sensor is located inside the detection channel and is a UV-visible spectrophotometer, which performs stain index detection on the incoming water flow in the detection channel.

[0023] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0024] 1. By automatically calibrating the baseline value of washing water at regular intervals or after a certain number of operations, users can adjust the effects of washing and rinsing clothes according to the water quality in their area.

[0025] 2. When measuring the baseline value of washing water in the user's home, if the baseline pollution index of washing water exceeds the normal range, a reminder will be issued to the user, so that the user's water safety is also guaranteed to a certain extent.

[0026] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0028] Figure 1 It is a schematic flow chart of a control method of a washing device of the present invention;

[0029] Figure 2 It is a schematic flow chart of a control method for washing equipment of the present invention for correcting a reference value;

[0030] Figure 3 It is a schematic flow chart of a washing stage of a control method for washing equipment of the present invention;

[0031] Figure 4 It is a schematic flow chart of a rinsing stage of a control method for a washing device of the present invention;

[0032] Figure 5 It is a schematic diagram of a flow chart of a control method for washing equipment to detect water quality according to the present invention;

[0033] Figure 6 It is a time-collection value experimental data curve diagram of a control method for a washing device of the present invention;

[0034] Figure 7 It is another time-collection value experimental data curve diagram of a control method for washing equipment of the present invention.

[0035] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiment 1

[0039] like Figure 1 As shown, this embodiment provides a control method for a washing device, comprising the following steps:

[0040] S1. After the rinsing phase of the washing program is completed, the washing equipment detects the water level in the barrel;

[0041] S2. If the detected water level is not lower than the calibration water level, open the water inlet valve and the drain valve to form running water in the barrel;

[0042] S3, a sensor detects a stain index of the running water;

[0043] S4. When the detected stain index remains unchanged within a preset time period, the currently detected stain index is taken as a reference value L0.

[0044] Specifically, when the reference value L0 needs to be calibrated, during the last rinsing stage of the current wash, after the sensor detects that the water level in the tub has reached the set calibration water level, the water inlet valve and the drain valve are controlled to open. The water inlet and drain volumes of the water inlet valve and the drain valve must be consistent, and it is necessary to ensure that the water level in the washing tub is not lower than the calibration water level, so that the water in the washing tub is always flowing. The sensor detects the living water, and when the detected stain index remains unchanged within a preset time, it means that the water quality of the washing water in the washing tub has stabilized at this time, and this stain index is taken as the newly calibrated reference value L0 of the washing water. By detecting the stain index of the living water in the washing tub to obtain the reference value L0 of the washing water, it is possible to avoid the situation where the stored water contacts the residual stains or detergents in the washing tub, etc., which may cause inaccurate measurements, and the reference value L0 of the washing water can be determined more accurately.

[0045] The washing device executes steps S1 to S4 to update the reference value L0 every predetermined time interval or every time the washing program is run for a preset number of times.

[0046] Specifically, Figure 2 As shown, the washing device will automatically calibrate the reference value of washing water every two months or after running a certain number of washing programs. When running the washing program this time, the washing device will automatically determine whether the time from the last time the reference value was obtained exceeds the predetermined time interval, or whether the number of operations from the last time the reference value was obtained has reached the preset number of times. If one of these two conditions is met, the washing device will execute steps S1 to S4 again at the end of this washing program to update the reference value L0 of washing water. By regularly updating the reference value L0, the accuracy of the washing threshold and the rinsing threshold determined based on the reference value L0 when the user washes is guaranteed, so that the user's washing effect can better meet the preset standards.

[0047] The washing device sets a cleaning threshold L1=L0+X, wherein X is a preset value;

[0048] When the washing device runs the washing stage of the washing program, if the stain index detected by the sensor is less than the cleaning threshold, washing continues; if the stain index detected by the sensor is greater than or equal to the cleaning threshold, the washing stage stops immediately.

[0049] Specifically, in the washing stage, a washing threshold L1 is set, and the washing threshold is obtained by adding a preset value X to the washing water reference value L0. The preset value X is an empirical value obtained from multiple experiments in the early stage. When the stain index detected by the sensor is smaller than the washing threshold L1, it means that the amount of stain dissolved in the washing tub during this washing is not enough and does not meet the standard of this washing threshold, and it is necessary to continue washing; when the stain index detected by the sensor is greater than or equal to the washing threshold L1, it means that the stain dissolved in the washing tub during this washing has reached the standard of the washing threshold. At this time, the washing program receives feedback from the sensor and immediately stops the washing stage.

[0050] like Figure 3 As shown, during the washing stage, the sensor is used to detect whether the amount of dissolved stains in the washing tub is sufficient. When the sensor detects that the stain index dissolved in the washing tub reaches the set cleaning threshold, it means that the washing stage has been completed, and the washing program cannot clean more stains by continuing to run. There can be multiple cleaning thresholds, representing different levels of dirtiness. When washing relatively dirty clothes, the washing program will select a cleaning threshold corresponding to a higher stain index. When washing relatively clean clothes, the washing program will select a cleaning threshold corresponding to a lower stain index. When the sensor detects that the stain index reaches the set cleaning threshold, the washing stage will be stopped.

[0051] When the sensor detects the stain index, the washing water can be detected in real time after a period of time after washing begins, or the washing water can be detected once at a certain time interval. When the detected stain index reaches the cleaning threshold, the washing stage can be stopped. By setting the cleaning threshold L1, the washing process can be better controlled, making the washing program more intelligent.

[0052] The washing device is also provided with a maximum washing time T. In the washing stage, when the running time of the washing stage reaches the maximum washing time T, the washing stage is ended.

[0053] Specifically, in the washing stage, a maximum washing time T is also set. When the stain index detected by the sensor does not reach the cleaning threshold, the washing device will continue to run the washing program until the maximum washing time T is reached, and then the washing stage ends. The washing stage is set with two end conditions: the stain index detected by the sensor is greater than or equal to the cleaning threshold, or the washing stage reaches the set maximum washing time. If either of these two conditions is met, the washing stage ends directly and enters the rinsing stage.

[0054] The washing device sets a rinsing threshold value L2=L0+Y, wherein Y is a preset value;

[0055] When the washing device runs the rinsing stage of the washing program, if the stain index detected by the sensor is greater than the rinsing threshold L2, the next rinse will continue after the current rinse is completed; if the stain index detected by the sensor is less than or equal to the rinsing threshold L2, the rinsing stage will end after the current rinse is completed.

[0056] Specifically, Figure 4 As shown, the rinsing stage includes one or more rinsing processes, and the duration of each rinsing is fixed. After one rinsing is completed, the water is drained first, and then the water is refilled for the next rinsing. In the rinsing stage, a rinsing threshold L2 is set, and the rinsing threshold is obtained by adding a preset value Y to the washing water reference value L0. The preset value Y is an empirical value obtained from multiple experiments in the early stage. When the stain index detected by the sensor is greater than the rinsing threshold, it means that the stain index of the rinsed clothes during this rinsing is large, and it is necessary to continue the next rinsing after the current rinsing is completed; when the stain index detected by the sensor is less than or equal to the rinsing threshold L1, it means that the stains dissolved in the washing barrel during this rinsing have reached the rinsing standard, and even if rinsing is performed again, no more stains will be dissolved, indicating that the rinsed clothes are already very clean. At this time, after the current rinsing process is completed, the rinsing stage can be ended.

[0057] During the rinsing stage, the sensor is used to detect the index of dissolved stains in the rinsing water in the washing tub. During a rinsing process, the sensor detects the stain index in the rinsing water at the end of each rinsing or a certain time before the end of rinsing. The stain index obtained at this time is the stain index during this rinsing process. When the dissolved stain index is less than the set rinsing threshold, it means that the clothes have been rinsed very clean and no more stains will be dissolved. If the sensor detects that the degree of stains in the washing water is higher than the set rinsing threshold after rinsing, it means that the clothes need to continue to be rinsed, and after the current rinse is completed, the next rinse will be continued. The sensor detects the degree of stains in the washing water again until the detected stain index is less than the rinsing threshold, and then rinsing is stopped after the end of this rinsing stage.

[0058] The washing device is provided with an upper limit N of the number of rinses. In the rinsing stage, when the number of rinses reaches N times, the rinsing stage ends after the current rinse is completed.

[0059] Specifically, in the rinsing stage, a maximum number of rinses N is also set. When the sensor detects that the dirt index in the washing tub is always higher than the rinsing threshold, after the current rinsing is completed, the next rinsing will be continued until the maximum number of rinses N is reached, and the rinsing stage is ended. The rinsing stage is set with two end conditions: the dirt index detected by the sensor is less than or equal to the rinsing threshold, or the number of rinses reaches the set maximum number of rinses N. If either of these two conditions is met, the rinsing stage is directly ended and the final dehydration is entered.

[0060] The washing device is preset with a normal value of the stain index. In step S3, if the detected stain index exceeds the normal value of the stain index, a reminder message is sent.

[0061] Specifically, Figure 5 As shown, at the end of the rinsing stage of this washing program, after the sensor detects that the water level in the tub has reached the set calibration water level, the water inlet valve and the drain valve are controlled to open. The water inlet and drain volumes of the water inlet valve and the drain valve must be consistent, and the water level in the washing tub must not be lower than the calibration water level, so that the water in the washing tub forms running water that flows continuously. Because the running water is water that continuously flows in from an external water source, the stain index of the running water detected this time is very close to the stain index obtained by directly detecting tap water.

[0062] Since the stain index of the running water detected in step S3 is equivalent to the stain index obtained by directly detecting tap water, the sensor can also be used as a water quality detector in the user's home. Although the geographical location of my country is different, resulting in different water quality in different regions, they are all within the range of water quality that can be used normally. The normal value of the stain index is the value obtained when stain detection is performed on tap water with qualified water quality. When the sensor calibrates the reference value of the washing water, if it is detected that the reference value stain index of the washing water is too high and exceeds the normal value of the stain index, a reminder will be issued to the user to remind the user to check the reason for the change in water quality, so as to avoid connecting the wrong water pipe and causing a non-clean water source to be connected to the washing equipment, that is, the clothes cannot be washed, and the washing equipment and clothes will also be damaged. If it is determined that there is a problem with the water quality, it can also serve to remind the user of water safety.

[0063] In this embodiment, the washing device detects the washing water reference value of the washing water in the washing tub at regular intervals or after a certain period of operation, and determines the washing threshold value during washing and the rinsing threshold value during rinsing according to the determined reference value. After the water entering the washing tub reaches the calibrated water level, the washing device controls the water inlet valve and the drain valve to open, so as to keep the water in the washing tub to form running water and not lower than the calibrated water level. By detecting stains on the running water formed in the washing tub, the accuracy of the washing water reference value is ensured, and then the washing threshold value and the rinsing threshold value can be ensured to be the most suitable values ​​for the user, so that the user can wash clothes more cleanly when washing clothes.

[0064] Embodiment 2

[0065] The difference between this embodiment and the above-mentioned embodiment 1 is that the control logic for controlling the end of the washing stage is different.

[0066] In this embodiment, during the washing stage, the sensor can also collect the stain index in the washing tub at regular intervals, and correspond the collected stain index to the time of collecting the stain index, thereby generating a time-collected value curve with the horizontal axis being the washing process running time and the vertical axis being the collected value of the stain index, such as Figure 6 and Figure 7 As shown, the slope of the curve can more intuitively reflect the change of the stain index over a period of time. When the slope of the curve is stable within the set range, it means that the stain has been completely dissolved, or the stubborn stain can no longer be dissolved in the washing water. At this time, it is in the cleaning state and the washing stage is over.

[0067] In this embodiment, the washing device is also provided with a maximum washing time T. When the time-collected value curve has not been stabilized within a set range, the washing program continues to run until the maximum washing time T is reached, and the washing stage is terminated. In this embodiment, two end conditions are set for the washing stage. When the time-collected value curve is stabilized within a set range, or the washing stage reaches the set maximum washing time, if either of the two conditions is met, the washing stage is directly terminated and the rinsing stage is entered.

[0068] Among them, Figure 6 and Figure 7 The portion between the two dotted lines of the time-collection value curve shown is a relatively flat portion, and the curves before and after this relatively flat portion have large fluctuations. If the interval time for detecting the stain index is too small, the points representing the stain index corresponding to the time shown in the figure will be very close to each other, and the change in the slope will be small. This portion will be identified as the slope being in a stable state and the clothes being washed, and the washing process will be mistakenly ended when there are still stains being dissolved. If the interval time for detecting the stain index is too large, the points representing the stain index corresponding to the time shown in the figure will be very far apart, and the change in the slope will be large, which cannot accurately reflect the rate of change in the amount of stains. Therefore, by Figure 6 and Figure 7 The time-collection value curve shown and previous multiple experiments can derive a suitable interval time for detecting the stain index, which can ensure the validity of the test results while also preventing the slope from changing too much and having no reference value.

[0069] Embodiment 3

[0070] This embodiment is a further limitation of the first embodiment. Each time the washing program is started, the operation of detecting the washing water stain index is performed. Before the washing stage starts, after the user adds clothes to the washing tub, the washing machine starts to fill with water without adding detergent. The sensor detects the water in the washing tub at this time, and when the water reaches the set water level L1, the detergent is automatically added. The water level L1 is the amount of water that is 5 cm above the stain sensor. When the washing device fills with water to the water level L1, the stain sensor detects stains on the washing water and obtains the reference value for this washing before adding detergent.

[0071] If the baseline value of the washing water detected this time is within the normal value range of the stain index, the baseline value obtained from this detection is used to calculate the washing threshold and the rinsing threshold for this washing; if the stain index detected this time exceeds the normal value range of the stain index, the value is considered abnormal, and the user may have manually added detergent, or there may be a problem with the detection device, etc., then this washing will still use the baseline value obtained from the previous detection stored in the washing equipment as the baseline value for this time, to prevent the situation where the washing program cannot be run due to an incorrect baseline value.

[0072] The method of this embodiment determines the reference value of washing water once before each washing stage, which can more accurately determine the water quality during each washing, thereby washing clothes better and cleaner.

[0073] Embodiment 4

[0074] This embodiment provides a washing device, which executes the control method of the washing device as described above.

[0075] In this embodiment, the washing device is provided with a detection channel. In steps S2 and S3, the water flow passing through the water inlet valve enters the detection area of ​​the sensor through the detection channel to detect the stain index.

[0076] Specifically, the washing device is also provided with a detection channel, through which tap water enters the sensor area to detect the washing water. When the stain index of the washing water in the washing tub is detected, in order to avoid other impurities being dissolved in the washing water after the washing water contacts clothes and detergent in the washing tub, thereby affecting the reference value of the measurement, the washing device is also provided with a detection channel. When the stain index of the washing water needs to be detected, an external water source is introduced into the detection channel, and when the stain index no longer changes, the sensor takes the stain index as the reference value for new detection calibration.

[0077] The sensor is located inside the detection channel and is an ultraviolet-visible spectrophotometer, which performs stain index detection on the incoming water flow in the detection channel to calibrate the reference value of the washing water.

[0078] Specifically, a sensor is provided inside the detection channel, and the sensor is an ultraviolet-visible spectrophotometer. The ultraviolet-visible spectrophotometer detects the amount of stains using ultraviolet absorption spectroscopy. The ultraviolet absorption spectroscopy detects the amount of stains by the corresponding relationship between the substance and its ultraviolet-visible spectrum when the substance absorbs light of a specific wavelength to reach the maximum value. The amount of stains includes a variety of substances that cannot be detected using conventional sensors. Conventional sensors such as infrared tube sensors cannot detect organic soluble stains, including oily stains, proteins, laundry detergents and emulsions, while the ultraviolet spectrum sensor can detect the above-mentioned organic soluble stains and insoluble particles. The ultraviolet-visible spectrophotometer performs real-time stain detection on washing water. When the detected stain index tends to be stable, does not change significantly, and is within the normal stain index range of washing water quality, this stain index is taken as the reference value of washing water.

[0079] In this embodiment, by setting up the detection channel, when the washing device calibrates the reference value of the washing water, there is a pipeline that can measure the reference value of the washing water more accurately without contacting impurities such as clothes and detergents. The ultraviolet-visible spectrophotometer set in the detection channel detects the washing water that forms the living water in the detection channel. When the detection value is stable, this value is taken as the reference value of this calibration. Through the ultraviolet-visible spectrophotometer, an accurate reference value of the washing water is obtained, and then a more accurate washing threshold and rinsing threshold are obtained, so that the washed clothes can be cleaned more.

[0080] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A method for controlling a washing device, characterized in that: The following steps are involved: S1. After the rinsing phase of the washing program is completed, the washing equipment detects the water level in the barrel; S2. If the detected water level is not lower than the calibration water level, open the water inlet valve and the drain valve to form running water in the barrel; S3, a sensor detects a stain index of the running water; S4. When the detected stain index remains unchanged within a preset time period, the currently detected stain index is taken as a reference value L0.

2. A control method for a washing device according to claim 1, characterized in that: The washing device executes steps S1 to S4 to update the reference value L0 every predetermined time interval or every time the washing program is run for a preset number of times.

3. A control method for a washing device according to claim 1, characterized in that: The washing device sets a cleaning threshold L1=L0+X, wherein X is a preset value; When the washing device runs the washing stage of the washing program, if the stain index detected by the sensor is less than the cleaning threshold L1, washing continues; if the stain index detected by the sensor is greater than or equal to the cleaning threshold L1, the washing stage stops immediately.

4. A control method for a washing device according to claim 3, characterized in that: The washing device is also provided with a maximum washing time T. In the washing stage, when the running time of the washing stage reaches the maximum washing time T, the washing stage is ended.

5. A control method for a washing device according to claim 1, characterized in that: The washing device sets a rinsing threshold value L2=L0+Y, wherein Y is a preset value; When the washing device runs the rinsing stage of the washing program, if the stain index detected by the sensor is greater than the rinsing threshold L2, the next rinse will continue after the current rinse is completed; if the stain index detected by the sensor is less than or equal to the rinsing threshold L2, the rinsing stage will end after the current rinse is completed.

6. A control method for a washing device according to claim 5, characterized in that: The washing device is provided with an upper limit N of the number of rinses. In the rinsing stage, when the number of rinses reaches N times, the rinsing stage ends after the current rinse is completed.

7. A control method for a washing device according to any one of claims 1 to 6, characterized in that: The washing device is preset with a normal value of the stain index. In step S3, if the detected stain index exceeds the normal value of the stain index, a reminder message is sent.

8. A washing device, characterized in that: The washing device executes a washing device control method as described in any one of claims 1 to 7.

9. A washing device according to claim 8, characterized in that: The washing device is provided with a detection channel. In steps S2 and S3, the water flow passing through the water inlet valve enters the detection area of ​​the sensor through the detection channel to detect the stain index.

10. A washing device according to claim 9, characterized in that: The sensor is located inside the detection channel and is an ultraviolet-visible spectrophotometer for detecting the stain index of the incoming water flow in the detection channel.

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