CN111088651A

CN111088651A - Real-time detection device for sewage of washing machine and detection control method thereof

Info

Publication number: CN111088651A
Application number: CN201911355674.2A
Authority: CN
Inventors: 李洋; 张雅茹; 许金钢; 周瑞英
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-05-01

Abstract

A real-time sewage detection device for a washing machine comprises a sensor, an electromagnetic valve and a shell, wherein the shell is provided with an upper flat part, a middle flat part and a lower flat part which form a height difference from top to bottom from left to right, a slope part I connected between the upper flat part and the middle flat part, and a slope part II connected between the middle flat part and the lower flat part, the slope part I and the slope part II are respectively provided with a stopper I with a round hole I and a stopper II with a round hole II, a barrier I is arranged at the joint of the slope part I and the middle flat part, a barrier II is arranged at the joint of the slope part II and the middle flat part, a floating ball is respectively accommodated between the round hole and the corresponding barrier, and the diameters of the round holes are respectively smaller than the diameters of the corresponding floating balls; the electromagnetic valve is arranged on the water injection pipe cavity connected with the middle flat part; the sensor is disposed on the middle flat portion. Also provides a detection control method for the real-time detection of the sewage in the washing machine.

Description

Real-time detection device for sewage of washing machine and detection control method thereof

Technical Field

The invention relates to the field of sewage detection, in particular to a real-time detection device for washing machine sewage and a detection control method thereof.

Background

With the development of society and the progress of science and technology, the quality of life of people is gradually improved, and almost every household has a washing machine nowadays. In order to achieve the best washing effect, save water resources and reduce electric energy consumption, various water quality sensors are additionally arranged on a plurality of intelligent washing machines on the market, and the washing time and times are judged by acquiring data through the sensors.

However, when the water flow speed is high, because various sensors can not accurately detect the water quality data, the water quality sensor of the existing washing machine is generally arranged at the position of a drain pipe or at the bottom of an outer barrel, a period is formed from water injection to water drainage, and the detection can be carried out only when the water is static after the completion of the period; or two electromagnetic valves are arranged at the position of the water discharge pipe at a certain distance, and the two electromagnetic valves are closed to detect the water after the water is static. The two detection control methods have the defects that the detection period is long, the detergent residue and the turbidity of the washing water cannot be detected in real time, and although the detection control method is improved compared with the traditional timing washing machine, certain waste of water resources and electric energy is still caused. Therefore, it is required to provide a sewage detection apparatus capable of detecting the quality of the washing water in real time.

Disclosure of Invention

In view of the above, the present invention provides a real-time detection apparatus for sewage in a washing machine and a control method for a washing machine using the same, thereby solving the problems that the quality of sewage cannot be detected in real time and water and electric energy are wasted.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

a real-time sewage detection device for a washing machine comprises a sensor, an electromagnetic valve and a shell, wherein the shell is provided with an upper flat part, a middle flat part and a lower flat part which form a height difference from top to bottom from left to right, a slope part I connected between the upper flat part and the middle flat part, and a slope part II connected between the middle flat part and the lower flat part, the slope part I is provided with a stopper I with a round hole I, the slope part II is provided with a stopper II with a round hole II, a barrier I is arranged at the joint of the slope part I and the middle flat part, a barrier II is arranged at the joint of the slope part II and the middle flat part, a floating ball I is accommodated between the round hole I and the barrier I, a floating ball II is accommodated between the round hole II and the barrier II, and the diameters of the round hole I and the round hole II are respectively smaller than; the electromagnetic valve is arranged on the water injection pipe cavity connected with the middle flat part; the sensor is disposed on the middle flat portion.

Compared with the prior art, the washing machine sewage real-time detection device has the advantages that: the washing machine is set to rotate forwards once and reversely once for one period, in the first half period, water flow downwards impacts the floating ball to open the inner cavity of the washing machine sewage real-time detection device, sewage in the device is updated, in the second half period, water flow reversely impacts the floating ball to close the inner cavity, a new sewage detection sample is obtained, water quality is detected through the sensor on the middle flat part, the period is short, data measurement is accurate, and real-time detection can be carried out in the water flowing process.

Preferably, the real-time detection device for the washing machine sewage further comprises filter screens, and the filter screens are respectively arranged on the upper flat part and the lower flat part.

Preferably, the obstacle is provided with a pore, and the maximum size of the pore is smaller than the diameter of the floating ball.

Preferably, the floating ball is a floating ball made of a material with density less than that of water or a hollow floating ball capable of floating on the water surface.

Preferably, the sensors are turbidity sensors and conductivity sensors.

Preferably, a water injection lumen is provided at the junction of the ramp portion I and the middle flat portion.

The invention also provides a washing machine control method using the washing machine sewage real-time detection device, which comprises the following steps:

step 1, installing a real-time sewage detection device of a washing machine;

step 2, opening an electromagnetic valve of the detection device and starting water injection;

step 3, when the water level is detected to be lower than the real-time sewage detection device of the washing machine, the controller controls the sensor to measure, so that clear water quality parameters are obtained and recorded by the controller;

step 4, starting washing, recording the water quality parameters of each period through a controller, and calculating the change rate of the water quality parameters of adjacent periods one by one, wherein the motor rotates forwards once and rotates backwards again once to be set as a period;

step 5, when the number of times that the change rate of the water quality parameters continuously approaches zero is larger than the set period number X, finishing washing, opening a drainage electromagnetic valve to discharge all sewage, and dehydrating; otherwise, continuing washing;

step 6, closing the drainage electromagnetic valve after dehydration is finished, and then opening the electromagnetic valve of the detection device for water injection until the water level reaches the required water amount;

step 7, starting rinsing, and calculating the water quality parameter change rate of the adjacent periods according to the data of each period recorded by the controller;

step 8, when the frequency of the change rate of the water quality parameter continuously approaching zero is greater than the set cycle number X, comparing the water quality parameter with the water quality parameter of the clear water, if the difference value of the water quality parameter and the clear water quality parameter approaches zero, opening a drain valve to drain the sewage and dewater, and finishing rinsing; otherwise, draining and dehydrating, and returning to the step 6;

and 9, after the controller detects that the washing articles are taken out, opening the electromagnetic valve of the detection device to flush the sensor for time t, and ending.

Compared with the prior art, the method disclosed by the invention has the following beneficial effects: firstly, the real-time detection of the water quality of the washing water is realized through a sensor and is recorded by a controller; secondly, the water quality parameter change rate can be calculated through the controller to set the washing time and the rinsing time, so that the water resource and the electric energy are saved to the maximum extent.

Preferably, in step 3, the measurement time of the sensor is less than 5 seconds.

Preferably, in step 5 and step 8, the number of cycles X is greater than or equal to 5.

Preferably, in step 9, the sensor time t =2 seconds is flushed.

Drawings

Fig. 1 is a front view of a real-time sewage detection apparatus of a washing machine according to the present invention.

FIG. 2 is a graph illustrating the conductivity and turbidity of fresh water measured without using the real-time wastewater detection device of a washing machine according to the present invention.

FIG. 3 is a graph showing the conductivity and turbidity of fresh water measured by using the real-time wastewater detection device of a washing machine according to the present invention.

Fig. 4 is a schematic view of the internal structure of a washing machine to which a real-time detection apparatus for contaminated water of a washing machine according to the present invention is mounted.

In the figure, a shell 1, a plastic floating ball I2, a plastic floating ball II 3, a turbidity sensor 4, a conductivity sensor 5, a filter screen I6, a filter screen II 7, a water injection electromagnetic valve 8, a cross-shaped obstacle I9, a cross-shaped obstacle II 10, a water injection pipe cavity 11, a water discharge electromagnetic valve 12, a dehydration barrel 13, an outer barrel 14, a water injection port 15, a water discharge port 16 and washing water 17.

Detailed Description

The invention will be further described with reference to the following figures and examples for a better understanding of the invention.

Fig. 1 is a front view of a real-time sewage detection apparatus of a washing machine according to the present invention. As shown in the figure, the real-time detection device for the sewage of the washing machine is composed of a shell 1, a plastic floating ball I2, a plastic floating ball II 3, a turbidity sensor 4, a conductivity sensor 5, a filter screen I6, a filter screen II 7, a water injection electromagnetic valve 8, a cross-shaped obstacle I9, a cross-shaped obstacle II 10 and a water injection pipe cavity 11.

The shell 1 has from the top down from left to right and forms the upper portion flat part of difference in height, middle part flat part, lower part flat part, connect the slope part I between upper portion flat part and middle part flat part, and connect the slope part II between middle part flat part and lower part flat part, be equipped with fender piece I on the slope part I, be equipped with on the slope part II and keep off piece II, keep off piece I and be the toper stage body that has round hole I, keep off piece II and be the toper stage body that has round hole II, the diameter that keeps off round hole I on the piece I is less than the diameter of plastic floater I2, the diameter that keeps off round hole II on the piece II is less than the diameter of plastic floater II 3. The water injection solenoid valve 8 is arranged on the water injection pipe cavity 11, the water injection pipe cavity 11 is located at the joint of the slope part I and the middle flat part, and water injection can be controlled by controlling the on-off of the water injection solenoid valve 8. The sensors are arranged on the middle flat part and comprise a turbidity sensor 4 and a conductivity sensor 5 which are respectively used for measuring the turbidity and the conductivity of the water.

In the embodiment, a cross-shaped obstacle I9 is arranged at the joint of the slope part I and the middle flat part; a cross-shaped obstacle II 10 is arranged at the joint of the slope part II and the lower flat part, the stopper I and the cross-shaped obstacle I9 jointly limit the moving space of the plastic floating ball I2, and the stopper II and the cross-shaped obstacle II 10 jointly limit the moving space of the plastic floating ball II 3.

In addition, in order to prevent large foreign matters generated in the washing water 17 from blocking the inner chamber during the washing process, dirt may occur in the washing water 17 during the washing process, a filtering net I6 is provided in an upper flat portion of the inner chamber of the real-time sewage detecting apparatus of the washing machine, and a filtering net II 7 is provided in a lower flat portion.

When the real-time detection device for the sewage of the washing machine is used, the real-time detection device is arranged between a dewatering barrel 13 and an outer barrel 14 of the washing machine and is close to the bottom of the washing machine, and a water injection pipe cavity 11 provided with a water injection electromagnetic valve 8 is connected with the tail end of a water inlet pipe of the washing machine. The water injection solenoid valve 8 is opened to inject water to wash the sensor, so that the surface of the sensor is ensured to be clean, the sensitivity of the sensor is prevented from being influenced, and the joint between the slope part I and the middle flat part can be washed by injected clean water to prevent dirt from being deposited; meanwhile, the sensor and the washing water are at the same temperature, so that the influence of temperature change on the measurement data of the sensor is eliminated, and inaccurate data measurement is avoided. When the water level reaches the required water amount, the water injection electromagnetic valve 8 is closed, the washing machine is started, and the motor starts to work. When the motor corotation, rivers flow from the top down, carry out great impurity through filter screen I6 earlier and filter, impact plastic floater I2 again and leave round hole I, and water flows in and continues to impact plastic floater I2 from round hole I, but under the blockking of cross obstacle I9, plastic floater I2 does not leave slope part I gliding, and water continues to impact plastic floater II 3 at the in-process that flows downwards, nevertheless under the blockking of cross obstacle II 10, plastic floater II 3 can not glide and leave washing machine sewage real-time detection device. On the contrary, when the motor reversal, the rivers direction then becomes from upwards down, carries out the filth through filter screen 7 earlier and filters, and under the impact of rivers, plastic floater II 3 rises and shutoff round hole II, and plastic floater II 2 rises under the buoyancy of water, shutoff round hole I, and at this moment, plastic floater 2 and plastic floater 3 seal detection device's inner chamber, form a inclosed space, can accomplish a water quality sampling. The controller controls the turbidity sensor 4, the conductivity sensor 5 starts to work, 100 times of data measurement are carried out, and the measurement time T is less than 5 seconds. Relatively accurate water quality data is obtained through a certain algorithm: and the turbidity TFS and the conductivity TDS realize real-time detection of water quality.

Fig. 2 is a graph showing the conductivity and turbidity of fresh water measured without using the real-time wastewater detection apparatus of a washing machine according to the present invention, in which a solid line TDS represents the conductivity of water and a dotted line TFS represents the turbidity of water. According to the graph, the turbidity and conductivity curve fluctuation measured under the condition of not using the real-time detection device for the sewage of the washing machine is very large, accurate data cannot be obtained, and the condition of water quality cannot be accurately reflected.

Fig. 3 is a graph showing the conductivity and turbidity of fresh water measured using the real-time wastewater detection apparatus of a washing machine according to the present invention, and the solid and dotted lines have the same meaning as fig. 2. According to the graph, the measured turbidity and the measured conductivity are almost straight lines without fluctuation after the detection device is used, so that the obtained water quality data is more accurate.

The invention also provides a detection control method of the washing machine sewage real-time detection device. Fig. 4 is a schematic view of the internal structure of a washing machine to which a real-time detection apparatus for contaminated water of a washing machine according to the present invention is mounted. The detection control method according to the present invention is realized by performing the steps of:

step 1, installing a real-time detection device for sewage of a washing machine between a dewatering barrel 13 and an outer barrel 14 of the washing machine and close to the bottom of the washing machine, wherein a water injection pipe cavity 11 provided with a water injection electromagnetic valve 8 is connected to the tail end of a water inlet pipe of the washing machine.

And 2, opening a water injection electromagnetic valve 8 of the detection device and starting water injection. When washing machine water injection, the clear water flows into inside turbidity sensor 4 and the conductivity sensor 5 of washing machine sewage real-time detection device, guarantees the surface cleaning of sensor, and measured data is accurate, and the clear water of pouring into moreover also can wash the junction between slope part I and the middle part flat portion, prevents the deposit of filth. Through the washing of water, turbidity sensor 4 and conductivity sensor 5 are the same temperature with the laundry water, have eliminated the influence of temperature variation to sensor measured data, reduce measuring error.

Step 3, when the water level sensor arranged in the washing machine detects that the water level is lower than the real-time detection device of the sewage of the washing machine, the controller starts the conductivity sensor 4 and the turbidity sensor 5, controls the conductivity sensor and the turbidity sensor to measure the water quality of the injected clean water, the total measurement times are 100 times, and the conductivity TDS of the clean water is obtained through a certain algorithm₀And turbidity TFS₀The controller records the two data and sets them as the calibration value of the clear water. The conductivity TDS of the clean water can be obtained by removing the first and the last points and the points with larger fluctuation on the measurement curve and averaging the rest points₀And turbidity TFS₀。

Step 4, after washing is started, the conductivity TDS and the turbidity TFS of each period are recorded through the controller, and the change rates △ TDS of the TDS and the TFS in adjacent periods are calculated one by one_I/△ t and △ TFS_I△ t, wherein, the motor rotates forward and backward again to set a period, I represents the I period, the conductivity and turbidity of the water measured in the I period are TDS_IAnd TFS_I△ t is the duration of each cycle, and the conductivity change rate and turbidity change rate of the I-th cycle are △ TDS_I=TDS_I-TDS_I-1，△TDS_I=TDS_I-TDS_I-1Wherein I is more than or equal to 1.

Step 5, △ TDS after I period is detected_I/△ t and △ TFS_IThe/△ t goes to zero respectively and always goes to zero from cycle I to cycle I + X (i.e., △ TDS_I+X/△ t and △ TFS_I+XThe/△ t respectively approaches to 0, wherein X is a set period number which can be set according to the washing intensity of a user, and X is preferably not less than5) When the washing is finished, a drain solenoid valve 12 provided in a drain pipe of the washing machine is opened to control the drainage of the waste water from a drain port 16 of the drain pipe, and then the washing is performed. When the above condition is not satisfied, the washing process is continued.

And 6, closing the drainage electromagnetic valve 12 after the dehydration is finished, then opening the water injection electromagnetic valve 8 of the real-time sewage detection device of the washing machine, and cleaning the sensor by using clean water until the water level reaches the required water amount.

Step 7, the washing machine starts the rinsing process, and the conductivity change rate △ TDS of the corresponding period is calculated through the data of each period recorded by the controller_I/△ t and turbidity Change Rate △ TFS_I/△t。

Step 8, △ TDS after the I period is detected_I/△ t and △ TFS_IThe/△ t goes to zero respectively and always goes to zero from cycle I to cycle I + X (i.e., △ TDS_I+X/△ t and △ TFS_I+X/△ t respectively approaching to 0), TDS and TFS and TDS at the moment are compared₀And TFS₀By comparison, if TDS_I+X-TDS₀And TFS_I+X-TFS₀Respectively approaching to zero, opening a drain valve to drain sewage and dewater, and finishing rinsing; otherwise, draining and dehydrating, returning to the step 6, and continuing to execute in sequence.

And 9, when the controller detects that the washed object is taken out, opening the electromagnetic valve to inject water, flushing the sensor for 2 seconds, and finishing the washing process.

By adopting the method disclosed by the invention, firstly, the water quality of the washing water 17 can be detected in real time through the sensor and recorded by the controller; and secondly, calculating the change rate of turbidity and conductivity by the controller, reflecting the saturation of the water soluble dirt of the washing water, the cleanliness of clothes and the residual degree of a detergent in the sewage, and setting the washing time and the rinsing time according to the change rate, thereby maximally saving water resources and electric energy.

The invention can be used not only in washing machines, but also in machines such as dish-washing machines and shoe-washing machines, etc. with similar principle to the washing machines.

The foregoing is merely a preferred embodiment of the present invention, and the present invention is not limited thereto. All structural changes and equivalents that may be made by using the teachings of the present invention and the accompanying drawings are intended to be included within the scope of the claims.

Claims

1. The utility model provides a washing machine sewage real-time detection device, includes sensor and solenoid valve, its characterized in that: the plastic floating ball type water pump is characterized by further comprising a shell, wherein the shell is provided with an upper flat part, a middle flat part and a lower flat part which form a height difference from top to bottom from left to right, a slope part I connected between the upper flat part and the middle flat part, and a slope part II connected between the middle flat part and the lower flat part, the slope part I is provided with a stopper I with a round hole I, the slope part II is provided with a stopper II with a round hole II, a barrier I is arranged at the joint of the slope part I and the middle flat part, a barrier II is arranged at the joint of the slope part II and the middle flat part, a floating ball I is accommodated between the round hole I and the barrier I, a floating ball II is accommodated between the round hole II and the barrier II, and the diameters of the round hole I and the round hole II;

the electromagnetic valve is arranged on the water injection pipe cavity connected with the middle flat part;

the sensor is disposed on the middle flat portion.

2. The real-time sewage detection device of the washing machine as claimed in claim 1, wherein: still include the filter screen, the filter screen sets up respectively on upper portion flat portion and lower part flat portion.

3. The real-time sewage detection device of the washing machine as claimed in claim 1, wherein: the obstacle is provided with a pore, and the maximum size of the pore is smaller than the diameter of the floating ball.

4. The real-time sewage detection device of the washing machine as claimed in claim 1, wherein: the floating ball is made of a material with density less than that of water or can float on the water surface.

5. The real-time sewage detection device of the washing machine as claimed in claim 1, wherein: the sensors are turbidity sensors and conductivity sensors.

6. The real-time sewage detection device of the washing machine as claimed in claim 1, wherein: the water injection lumen is provided at the junction of the ramp portion I and the middle flat portion.

7. A detection control method of the real-time detection device for the sewage of the washing machine as claimed in any one of claims 1 to 5 is carried out according to the following steps:

step 1, installing a real-time sewage detection device of a washing machine;

step 6, after the dehydration is finished, closing the drainage electromagnetic valve, and then opening the electromagnetic valve of the detection device for water injection until the water level reaches the required water amount;

8. The detection control method according to claim 6, characterized in that: in step 3, the measurement time of the sensor is less than 5 seconds.

9. The detection control method according to claim 6, characterized in that: in step 5 and step 8, the number X of cycles is more than or equal to 5.

10. The detection control method according to claim 6, characterized in that: in step 9, the sensor time t =2 seconds.