阅读说明：本技术 一种洗碗机的控制方法 (Control method of dish washing machine ) 是由 姜伟 解婷 于 2020-04-20 设计创作，主要内容包括：本发明公开了一种洗碗机的控制方法,包括控制系统和用于检测排水浊度的浊度检测装置,控制系统根据浊度检测装置检测的排水浊度值控制后续洗涤过程。通过控制系统根据浊度检测装置检测的排水浊度值控制后续洗涤过程,即不同的排水浊度值对应不同的洗涤时间和进排水频率,这种设置方式能够有效节约后续的洗涤时间和洗涤用水量,在保证清洁程度合格的情况下,有效节约了水资源和电能,提升了洗涤准确精度,节约了用户的时间,使得洗碗机洗涤效率更高,提升了用户体验感。(The invention discloses a control method of a dish washing machine, which comprises a control system and a turbidity detection device for detecting the turbidity of discharged water, wherein the control system controls the subsequent washing process according to the turbidity value of the discharged water detected by the turbidity detection device. Follow-up washing process of drainage turbidity value control through control system according to turbidity detection device detects, different drainage turbidity values correspond different washing time and advance drainage frequency promptly, and subsequent washing time and washing water consumption can effectively be practiced thrift to this kind of mode of setting, under the qualified circumstances of assurance cleanliness factor, has effectively practiced thrift water resource and electric energy, has promoted the accurate precision of washing, has practiced thrift user's time for dish washer washing efficiency is higher, has promoted user experience and has felt.)

1. A control method of a dishwasher including a control system and a turbidity detecting device for detecting turbidity of drain water, characterized in that: and the control system controls the subsequent washing process according to the drainage turbidity value detected by the turbidity detection device.

2. The control method of a dishwasher according to claim 1, wherein: the turbidity value S of the discharged water is greater than the preset turbidity value S₀When S is less than S, the control increases the subsequent washing time t₀And then, the control reduces the subsequent washing time t.

3. The control method of a dishwasher according to claim 2, wherein: the preset turbidity value S₀Corresponding to a preset washing time t₀When S > S₀Then, the subsequent washing time t is t ═ t₀+t₁When S < S₀Then, the subsequent washing time t is t ═ t₀-t₁Said t is₁Is a factory default value.

4. A control method of a dishwasher according to any one of claims 1 to 3, characterized in that: the turbidity value S of the discharged water is greater than the preset turbidity value S₀When S is less than S, the water inlet and outlet frequency v is controlled to be increased₀And controlling to reduce the water inlet and outlet frequency v.

5. The control method of a dishwasher according to claim 4, wherein: said S₀Corresponding to preset water inlet and outlet frequency v₀When S > S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀+v₁When S < S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀-v₁Said v is₁Is a factory default value.

6. The control method of a dishwasher according to claim 1, wherein: preset limit turbidity value S₁Said S₁＞＞S₀When S > S₁When the water is drained, the water inlet and the water outlet frequency v is controlled to be v₂Said v is₂For factory default, when S₀＜S＜S₁And the control increases the washing time t and/or the water inlet and outlet frequency v.

7. The control method of a dishwasher according to claim 1, wherein: predetermined critical turbidity value S₂Said S₂＜S₀When S is₂＜S＜S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀-v₁Or, the subsequent washing time t is t ═ t₀-t₁When S is less than or equal to S₂When the washing process is finished, the control is carried out,

or, when S is less than or equal to S₂And controlling the washing process to be ended and controlling the rinsing process to be entered.

8. The control method of a dishwasher according to claim 7, wherein: predetermined critical turbidity value S₂Corresponding to preset water inlet and outlet frequency v₀', when S ═ S₂The subsequent water intake and drainage frequency v ═ v₀', when S < S₂When the water is drained, the water inlet and drainage frequency v is controlled to be reduced;

preferably, the frequency v ═ v of the subsequent water intake and discharge₀’-v₃Said v is₃Is a factory default value.

9. The control method of a dishwasher according to claim 7, wherein: predetermined critical turbidity value S₂Corresponding to the preset rinsing time t₀', when S ═ S₂Controlling the rinsing time t ═ t₀', when S < S₂Then, the rinsing time t' is controlled to t ═ t₀’-t₂Said t is₂Is a factory default value.

10. The control method of a dishwasher according to any one of claims 7 to 9, wherein: presetting terminal critical turbidity value S₃When S is₃＜S＜S₂When the water is drained, the water inlet and drainage frequency v is controlled to be reduced, or the rinsing time t' is reduced, when S is less than or equal to S₃The rinsing process is ended.

Technical Field

The invention belongs to the technical field of mechanical equipment, and particularly relates to a control method of a dish-washing machine.

Background

Along with the improvement of the living standard of people, the requirement of consumers on kitchen household environment is higher and higher, and the dish washing machine is more and more favored by the consumers as the kitchen electricity necessary for the modern intelligent kitchen. Most of the dish-washing machines on the market have fixed time and steps, and only a few of the dish-washing machines have a function of judging the degree of soiling of tableware. However, in an automatic dishwasher having a function of determining the degree of soiling of tableware, the precision of the turbidity sensor, the mounting position, and the environmental conditions affect the tableware soiling recognition, and the turbidity value cannot be accurately measured, so that the cleaning efficiency cannot be ensured. In addition, the water and electricity saving and automatic washing can not be achieved well. Currently, most turbidity sensors are installed in the sump of a dishwasher for detecting the turbidity of the washing water in the sump. Furthermore, the location of the turbidity detector of the existing dishwasher is inside the dishwasher and mostly at the bottom. Impurity pollutants and the like in the aqueous solution can be accumulated in a deposition form, so that the detection value at the bottom is inaccurate, the detection effect of the turbidity sensor is directly influenced, wrong judgment is caused, redundant washing times are triggered, resources are wasted, and the washing time is prolonged. The current control method of the dish washing machine controls the switching of washing programs through a turbidity detector, does not regulate and control the washing process in real time according to the turbidity value of washing water, and washes by adopting the same washing time and water inlet and outlet frequency when the turbidity value is lower and higher, thereby wasting a large amount of water resources and electric energy, causing the waste of energy, wasting the washing time of a user and causing great loss for the user.

Chinese patent application No. CN201910894793.9 discloses a turbidity detection structure, method, washing machine and storage medium for washing machine, including: the barrel body, the drain valve, the water pump and the circulating water pipe are connected in sequence; a connecting pipe is arranged between the drain valve and the water pump, and a sewage turbidity detection device is arranged on the connecting pipe; the drain valve and the water suction pump are arranged at the bottom of the barrel body, and one end, deviating from the water suction pump, of the circulating water pipe is arranged above the barrel body. Although the turbidity detection device is arranged on the connecting pipe, the turbidity of the washing water circulating in the connecting pipe can be detected in real time through the turbidity detection device, and the detection precision of the turbidity is improved, the washing time and the washing frequency are not further adjusted according to different drainage turbidity, a large amount of water resources and electric energy are wasted, a large amount of washing time is wasted, and the user experience is poor.

The present invention has been made in view of this situation.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a control method of a dishwasher.

In order to solve the technical problems, the invention adopts the technical scheme that: a control method of a dish washing machine comprises a control system and a turbidity detection device for detecting the turbidity of discharged water, wherein the control system controls the subsequent washing process according to the turbidity value of the discharged water detected by the turbidity detection device.

Further, the drainage turbidity value S is larger than the preset turbidity value S₀When S is less than S, the control increases the subsequent washing time t₀And then, the control reduces the subsequent washing time t.

Further, the preset turbidity value S₀Corresponding to a preset washing time t₀When S > S₀Then, the subsequent washing time t is t ═ t₀+ t1 when S < S₀Then, the subsequent washing time t is t ═ t₀-t₁Said t is₁Is a factory default value.

Further, the drainage turbidity value S is larger than the preset turbidity value S₀When S is less than S, the water inlet and outlet frequency v is controlled to be increased₀And controlling to reduce the water inlet and outlet frequency v.

Further, said S₀Corresponding to preset water inlet and outlet frequency v₀When S > S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀+v₁When S < S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀-v₁Said v is₁Is a factory default value.

Further, a limit turbidity value S is preset₁Said S₁＞＞S₀When S > S₁When the water is drained, the water inlet and the water outlet frequency v is controlled to be v₂Said v is₂For factory default, when S₀＜S＜S₁And the control increases the washing time t and/or the water inlet and outlet frequency v.

Further, a critical turbidity value S is preset₂Said S₂＜S₀When S is₂＜S＜S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀-v₁Or, the subsequent washing time t is t ═ t₀-t₁When S is less than or equal to S₂When the washing process is finished, the control is carried out,

or, when S is less than or equal to S₂And controlling the washing process to be ended and controlling the rinsing process to be entered.

Further, a critical turbidity value S is preset₂Corresponding to preset water inlet and outlet frequency v₀', when S ═ S₂The subsequent water intake and drainage frequency v ═ v₀', when S < S₂When the water is drained, the water inlet and drainage frequency v is controlled to be reduced;

further, a critical turbidity value S is preset₂Corresponding to the preset rinsing time t₀', when S ═ S₂Controlling the rinsing time t ═ t₀', when S < S2, controlling rinsing time t' ═ t₀’-t₂Said t is₂Is a factory default value.

Further, a terminal critical turbidity value S is preset₃When S is₃＜S＜S₂When the water is drained, the water inlet and drainage frequency v is controlled to be reduced, or the rinsing time t' is reduced, when S is less than or equal to S₃The rinsing process is ended.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.

1. Follow-up washing process is controlled according to the drainage turbidity value that turbidity detection device detected through control system, can effectively practice thrift follow-up washing time and washing water consumption, under the qualified circumstances of assurance cleanliness factor, adopt different washing time and advance drainage frequency to different turbidity values, effectively practiced thrift water resource and electric energy, promoted the washing degree of accuracy, effectively practiced thrift user's time simultaneously for dish washer washing efficiency is higher, has promoted user experience.

2. By making the drainage turbidity value S larger than a preset turbidity value S₀When S is less than S, the control increases the subsequent washing time t₀And in time, the subsequent washing time t is reduced by control, the washing time of the dish washing machine is effectively saved, and the washing efficiency is improved.

3. By setting the turbidity value S of the discharged water to be greater than a preset turbidity valueValue S₀When S is less than S, the water inlet and outlet frequency v is controlled to be increased₀When the turbidity value is small, the tableware can be washed clean without draining for many times, and the water consumption is effectively saved.

4. By presetting a limit turbidity value S₁And S is₁＞＞S₀When S > S₁When the water is drained, the water inlet and the water outlet frequency v is controlled to be v₂Said v is₂For factory default, when S₀＜S＜S₁When the turbidity value is too large, only the water is controlled to be drained, and the washing is not carried out, so that the washing water with the large turbidity value is prevented from dirtying the tableware, and the washing efficiency is further improved.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a flow chart of a control method of the present invention;

FIG. 2 is a flow chart of another control method of the present invention;

FIG. 3 is a flow chart of yet another control method of the present invention;

FIG. 4 is a flow chart of yet another control method of the present invention;

FIG. 5 is a schematic view of the dishwasher assembly of the present invention;

fig. 6 is a schematic view of the enlarged structure of the portion a in fig. 5 according to the present invention.

In the figure: 1. a dishwasher; 11. a dishwasher liner; 12. a spray arm; 13. a washing pump; 14. a water tank; 15. draining pump; 16 water discharge pipes; 17. a control system; 2. a turbidity detecting device; 20. a signal receiving end; 21. a first end; 22. a signal transmitting terminal; 23. a second end.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 6, the present invention provides a control method of a dishwasher, and further, relates to a structure of a dishwasher using the control of the control method. As an embodiment of the invention, the dishwasher 1 comprises a control system 17 and turbidity detecting means 2 for detecting the turbidity of the drain water. The control system controls the subsequent washing process according to the drainage turbidity value detected by the turbidity detection device 2. In particular, the dishwasher 1 may involve a plurality of washing stages in a complete washing process, each washing stage corresponding to a plurality of water intakes and drains. The control method of the invention detects the drainage turbidity values of the last drainage of different washing stages, and regulates and controls the washing time or the water inlet and outlet frequency of the subsequent washing stages according to the turbidity values. The water inlet and outlet frequency refers to the water inlet and outlet times in one washing stage, and the higher the water inlet and outlet times in one washing stage, the higher the water inlet and outlet frequency. The washing time refers to the time required to complete one washing stage.

As an embodiment of the present embodiment, when the turbidity value of the drained water detected by the turbidity detecting device 2 is larger, the control system 17 controls the washing time in the subsequent washing stage to be increased, which is beneficial for washing the dishes in the dishwasher 1. When the drainage turbidity value detected by the turbidity detection device 2 is small, the control system 17 controls the washing time in the subsequent washing stage to be reduced, so that the washing time is shortened on the premise of cleaning up tableware, the washing efficiency can be improved, and the waste of water resources is reduced. As another embodiment of the present embodiment, when the turbidity value of the drained water detected by the turbidity detecting device 2 is larger, the control system 17 controls the water inlet and outlet frequency to increase in the subsequent washing stage, which is beneficial to clean the dishes in the dishwasher 1. When the drainage turbidity value that turbidity detection device 2 detected is less, the water inlet and outlet frequency of control system 17 control in the subsequent washing stage is less, under the prerequisite that can the sanitization tableware, reduces water inlet and outlet frequency, has greatly reduced the water consumption, on the basis of promoting washing efficiency, has reduced the waste of water resource.

As another embodiment of the present embodiment, when the turbidity value of the discharged water detected by the turbidity detecting device 2 is larger, the control system 17 controls to increase the washing time and the water inlet and outlet frequency in the subsequent washing stage, which is more beneficial to clean the dishes in the dishwasher 1; when the drainage turbidity value that turbidity detection device 2 detected is less, the water inlet and outlet frequency of control system 17 control in the subsequent washing stage is less, reduces subsequent washing time simultaneously, under the qualified circumstances of assurance tableware cleaning degree, adopts different washing time and water inlet and outlet frequency to different turbidity, has effectively practiced thrift water resource and electric energy, has promoted the washing degree of accuracy, has effectively practiced thrift user's time simultaneously for dish washer washing efficiency is higher, has promoted user experience.

As another embodiment of the invention, the dishwasher 1 has a preset turbidity value S, as shown in FIG. 1₀A preset turbidity value S₀Can be designed according to the type of the dish washer and the requirement of the user on the cleanness degree of the tableware. When the turbidity value S of the discharged water detected by the turbidity detection device 2 is larger than the preset turbidity value S₀When S is less than S, the control increases the subsequent washing time t₀And then, the control reduces the subsequent washing time t. As an implementation manner of this embodiment, when the subsequent washing time t is increased, it may be increased according to a certain ratio, such as: when S is larger than the preset turbidity value S₀When the washing time t is increased to the original S/S₀And (4) doubling. When S is less than S₀When the subsequent washing time t is reduced, the subsequent washing time t can be reduced according to a certain proportion, such as: when S is less than the preset turbidity value S₀When the washing time t is reduced to the original S/S₀And (4) doubling. As another embodiment of this embodiment, the turbidity value S is preset₀Corresponding to a preset washing time t₀When S > S₀Then, the subsequent washing time t is t ═ t₀+t₁When S < S₀Then, the subsequent washing time t is t ═ t₀-t₁Said t is₁The preset value for factory production is as follows: when the preset washing time t₀Is 10min, t₁Is 3 min. Alternatively, the increase and decrease values of the washing time t are different, such as: when S is larger than the preset turbidity value S₀Then, the washing time t is increased by 3 min; when S is less than S₀Then, the subsequent washing time t is decreased by 2 min. By making the drainage turbidity value S larger than a preset turbidity value S₀When S is less than S, the control increases the subsequent washing time t₀And in time, the subsequent washing time t is reduced by control, the washing time of the dish washing machine is effectively saved, and the washing efficiency is improved.

As another embodiment of the present invention, as shown in FIG. 2, when the discharged water detected by the turbidity detecting means 2 is turbidThe value S is greater than the preset turbidity value S₀When S is less than S, the control increases the subsequent water feeding and draining frequency v₀And controlling to reduce the subsequent water inlet and outlet frequency v. As an implementation manner of the embodiment, when the subsequent water feeding and draining frequency v is increased, the subsequent water feeding and draining frequency v can be increased according to a certain proportion, such as when S is larger than the preset turbidity value S₀When the water is discharged, the water inlet and discharge frequency v is increased to the original S/S₀And (4) doubling. When S is less than S₀When the subsequent water inlet and outlet frequency v is reduced, the subsequent water inlet and outlet frequency v can be reduced according to a certain proportion, such as when S is smaller than the preset turbidity value S₀When the water inlet and outlet frequency v is reduced to the original S/S₀And (4) doubling. As another implementation manner of this embodiment, S is₀Corresponding to preset water inlet and outlet frequency v₀When S > S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀+v₁(ii) a When S is less than S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀-v₁(ii) a V is₁Is a factory default value. By making the drainage turbidity value S larger than a preset turbidity value S₀When S is less than S, the water inlet and outlet frequency v is controlled to be increased₀When the turbidity value is small, the tableware can be washed clean without draining for many times, and the water consumption is effectively saved.

As an embodiment of the present invention, as shown in FIG. 3, a limit turbidity value S is preset₁Said S₁Is much greater than S₀Such as: s₁Is 500, S₀Is 150. When S > S₁When the water is drained, the water inlet and the water outlet frequency v is controlled to be v₂Said v is₂Is a factory default value. Specifically, when the turbidity detecting means 2 detects a drain turbidity value S larger than a preset limit turbidity value S₁When the washing machine is used, the turbidity of the washing water is large, the subsequent washing process is controlled to carry out water inlet and water outlet for many times, the tableware is flushed, repeated washing is not carried out, the washing water with the large turbidity is prevented from being used for repeatedly washing the tableware, and the washing effect is poor. This kind of embodiment can effectively promote washing efficiency, can also promote clean dynamics. When S is₀＜S＜S₁And the control increases the washing time t and/or the water inlet and outlet frequency v. Specifically, when the drainage turbidity value S is larger than the preset turbidity value S₀And less than the limit turbidity value S₁Increasing the washing time t through control; or increasing water inlet and outlet frequency v; or, increase washing time t and advance drainage frequency v simultaneously, on the basis of guaranteeing that the tableware can be clean, reduced the waste of water resource, promoted the washing efficiency.

As a further embodiment of the invention, the critical turbidity value S is preset₂Said S₂＜S₀Such as: s₂Is 75, S₀Is 150. When S is₂＜S＜S₀Then, the frequency v ═ v of the subsequent water intake and discharge₀-v₁(ii) a Or the subsequent washing time t is t ═ t₀-t₁(ii) a Or simultaneously controlling the subsequent water feeding and draining frequency v-v₀-v₁And the subsequent washing time t is t ═ t₀-t₁. When S is less than or equal to S₂And the washing process is controlled to be finished, the whole washing process is completed, the control mode is simple, the waste of water resources is effectively reduced, and the washing efficiency is improved.

As another implementation of this embodiment, when S ≦ S₂And then, the washing process is controlled to be finished and the washing process is controlled to enter the rinsing process, so that the tableware in the dish washer 1 is further rinsed, the cleanness degree of the tableware is increased, and the tableware is more sanitary. The rinsing process comprises a plurality of rinsing stages, and each rinsing stage corresponds to a plurality of water feeding and draining. The control method of the invention detects the drainage turbidity values of the last drainage in different rinsing stages, and regulates and controls the rinsing time or the water inlet and outlet frequency in the subsequent rinsing stages according to the turbidity values. The water inlet and outlet frequency refers to the water inlet and outlet times in a rinsing stage, and the higher the water inlet and outlet times in a washing stage, the higher the water inlet and outlet frequency. The rinsing time refers to the time required to complete one rinsing stage. Further, a critical turbidity value S is preset₂Corresponding to preset water inlet and outlet frequency v₀', when S ═ S₂The subsequent water intake and drainage frequency v ═ v₀', when S < S₂And controlling to reduce the water inlet and outlet frequency v. The water inlet and outlet frequency v can be reduced by a certain multiple, such as reducing the original S/S₂Doubling; or the subsequent water feeding and draining frequency v-v₀’-v₃Said v is₃Is a factory default value. The mode effectively reduces the using amount of the washing water of the dishwasher 1 in the rinsing stage and saves water resources on the premise that the tableware in the dishwasher 1 can be cleaned.

Further, a critical turbidity value S is preset₂Corresponding to the preset rinsing time t₀', such as: t is t₀' -10 min, when S-S₂Controlling the rinsing time t as t₀', when S < S₂When the rinsing time t' is controlled to be reduced; the subsequent rinsing time t' may be reduced by a factor, e.g. by reducing the original S/S₂Doubling; alternatively, the subsequent rinsing time t ═ t₀’-t₂Said t is₂The preset value for factory production is as follows: t is t₂3 min. In this way, on the premise that the tableware in the dishwasher 1 can be washed clean, the rinsing time of the dishwasher 1 in the rinsing stage is effectively reduced, and the rinsing efficiency is improved.

As shown in FIG. 4, the dishwasher 1 of the present invention presets a terminal critical turbidity value S₃Such as: s₃Is 1. When S is₃＜S＜S₂In this case, the control decreases the water supply and drainage frequency v, or decreases the rinsing time t'. When S is less than or equal to S₃Finish the rinsing process, accomplish whole washing and rinsing process, whole process not only makes the tableware clean, can also save the washing time, and the using water volume is practiced thrift, promotes user experience.

As shown in fig. 5 and 6, the dishwasher 1 of the present invention further includes a dishwasher tub 11, a spray arm 12, a washing pump 13, a water tank 14, a drain pump 15, and a drain pipe 16. Wherein the drain pipe 16 is communicated with the drain pump 15, and the drain pump 15 is used for pumping the washing water in the dishwasher to the drain pipe 16 and pumping out through the drain pipe. The drain pipe 16 includes a vertical section, and the turbidity detecting device 2 is disposed on the vertical section of the drain pipe 16, and is configured to detect turbidity of the washing water in the drain pipe 16. Further, the vertical section is at least partially arranged higher than the bottom of the water tank 14, and the turbidity detecting device 2 is arranged in the area of the vertical section higher than the bottom of the water tank 14. The position that drain pipe 16 was detected by turbidity monitoring devices 2 does not have turbid liquid deposit among this kind of setting mode, guarantees when examining at every turn, all is the inside solution of dish washer true turbidity state, has improved the degree of accuracy that detects.

The turbidity monitoring device 2 of the present invention comprises a signal receiving terminal 20 and a signal transmitting terminal 22. The signal receiving end 20 and the signal emitting end 22 are disposed on the side wall of the drain pipe 16. Preferably, the signal receiving end 20 and the signal emitting end 22 are radially disposed on a sidewall of the drain pipe 16 and are symmetrical about a central axis of the drain pipe 16, and the first end 21 of the drain pipe 16 and the second end of the drain pipe 16 communicate with the drain pipe, respectively. This mounting is simple in construction and the turbidity monitoring device 2 does not occupy the interior space of the drain pipe 16 and does not affect the normal draining action of the dishwasher 1.

When the dishwasher 1 is used for washing, the control system 17 controls the washing pump 13 to pump water solution into the dishwasher liner 11 to drive the sprayer 12 to rotate for spraying and washing. After the washing stage is accomplished, can carry out once complete drainage procedure, drain pump 15 can discharge the aqueous solution in the dishwasher inner bag 1 through drain pipe 16, and after the aqueous solution was full of drain pipe 16, turbidity detection device 2 intervened work, carries out once turbidity detection device 2 to this stage, obtains a drainage turbidity value S to carry out the contrast with drainage turbidity value S and predetermined turbidity parameter value. The turbidity value parameter is the ratio of the measured voltage to the calibration voltage, and the smaller the ratio, the lower the received light-sensitive current, the higher the water turbidity value S in the dishwasher. Preferably, the turbidity value in the invention is the average value of 4 turbidity detections, the detection time is 15s each time, 1min is needed, and the detection accuracy is high.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.