CN114098582A - System and method for detecting amount of foam in household appliance - Google Patents
System and method for detecting amount of foam in household appliance Download PDFInfo
- Publication number
- CN114098582A CN114098582A CN202111369409.7A CN202111369409A CN114098582A CN 114098582 A CN114098582 A CN 114098582A CN 202111369409 A CN202111369409 A CN 202111369409A CN 114098582 A CN114098582 A CN 114098582A
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- foam
- household appliance
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- sensor
- detection
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- 239000006260 foam Substances 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000005406 washing Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 241000190070 Sarracenia purpurea Species 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4297—Arrangements for detecting or measuring the condition of the washing water, e.g. turbidity
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
- A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L15/00—Washing or rinsing machines for crockery or tableware
- A47L15/42—Details
- A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
- A47L15/4223—Devices for water discharge, e.g. devices to prevent siphoning, non-return valves
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/22—Condition of the washing liquid, e.g. turbidity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Water Supply & Treatment (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Control Of Washing Machine And Dryer (AREA)
Abstract
The invention discloses a system and a method for detecting the amount of foam in a household appliance. The detection method comprises the following steps: step 1) intermittently sending detection signals through a foam sensor, wherein the duration of each time of sending the detection signals is S i ，i1, 2, … C, wherein C is more than or equal to 1; the interval time between every two times of sending the detection signal is T j ，j=1，2，2，…C-1, wherein C is more than or equal to 1; at S i The number of times of sending the detection signal in time is recorded as M i ，i1, 2, … C, wherein C is more than or equal to 1; at S i The number of foam detected over time was recorded as N i ，i1, 2, … C, wherein C is more than or equal to 1; step 2) calculating the amount of foam, wherein the amount of foam P = (N1 + N2+ … + N) i ）/（M1+M2+…+M i ) 100% the detection system and method of the present invention are both very simple in structure and method, high in accuracy of detecting foam amount and foam amount variation, and provide basis for processing foam in household appliances.
Description
Technical Field
The invention belongs to the technical field of household appliances, and particularly relates to a system and a method for detecting the amount of foam in a household appliance.
Background
Household appliances used for washing, such as washing machines, dishwashers, generate foam during operation. In the working process, if too much foam is generated, the working process is influenced, and the foam is required to be reduced by spraying and the like. It is also generally desirable to control the amount of foam within a set threshold at the end of the job or after the job is completed. The foam is treated on the premise that the amount of foam in the household appliance needs to be detected for a certain period of time.
The current common detection mode comprises the steps of detecting whether foam exists by adopting a liquid level sensor, a photoelectric sensor and the like. Detecting foam by adopting a liquid level sensor, detecting liquid level change mainly through difference of internal air pressure and external air pressure, and judging whether foam exists or not by comparing the liquid level change; a disadvantage of this detection method is that false positives may occur if detection or other problems during draining cause the water to not be drained. Detecting foams by adopting a photoelectric sensor, and judging whether the foams exist or not by detecting the difference of external media of the photoelectric sensor; when foam is attached to the surface of the photoelectric sensor, the detection result is interfered, and misjudgment is caused. The method can only detect whether the foam exists, and cannot detect the foam quantity.
For example, chinese patent publication No. CN108978113A describes a method for detecting bubbles in a washing machine. The method for detecting foam described in the patent of the invention judges whether excessive foam is generated in the washing machine according to the value of the liquid level sensor.
US patent No. US9861248B2 discloses an optical sensor for water-air detection that is capable of detecting the presence of foam, but cannot directly detect the amount of foam. Other types of foam sensors exist in the art that are capable of detecting the presence of foam.
Disclosure of Invention
The invention aims to provide a system and a method for detecting the amount of foam in a household appliance, which can accurately detect the amount of foam in the household appliance and provide a basis for processing the foam.
In order to realize the purpose, the invention adopts the following technical scheme:
a foam detection system for a household appliance comprises a household appliance body, a control subsystem and a foam sensor, wherein the foam sensor is installed in the household appliance body and is connected to the control subsystem.
Further, the household appliance comprises a water cavity, and the foam sensor is installed in the water cavity; or, an open container is arranged outside the water cavity, the container is communicated with the water cavity, and the foam sensor is arranged in the container.
In another refinement, the household appliance comprises a drain pipe, the foam sensor being mounted in the drain pipe.
Further, the household appliance is a drum washing machine, the drum washing machine comprises an inner drum and an outer drum, and the foam sensor is installed between the inner drum and the outer drum.
Further, the household appliance is a dishwasher, the dishwasher comprises a water cup, and the foam sensor is installed in the water cup.
Further, the installation height of the foam sensor is a default water inlet level.
A method for detecting the amount of foam in a household appliance, comprising the steps of:
step 1) intermittently sending detection signals through a foam sensor, wherein the duration of each time of sending the detection signals is S i ，i1, 2, … C, wherein C is more than or equal to 1; the interval time between every two times of sending the detection signal is T j ，j1, 2, 2, … C-1, wherein C is more than or equal to 1; at S i The number of times of sending the detection signal in time is recorded as M i ，i1, 2, … C, wherein C is more than or equal to 1; at S i The number of foam detected over time was recorded as N i ，i=1，2，…C，C≥1；
Step 2) calculating the amount of foam, wherein the amount of foam P = (N1 + N2+ … + N) i ）/（M1+M2+…+M i ）*100%.
Further, when C is more than or equal to 2, S is1=S2=…= S i . The continuous time of sending the detection signal every time is the same, the foam amount of single detection can be monitored in real time, the foam amount difference of each time is compared, particularly, the foam amount difference of two adjacent times can be judged, whether the foam has the situation of accelerated breakage or not can be judged, and the effect of accelerated breakage can be realized.
Further, when C is more than or equal to 2, T is1=T2=…=T j .
The invention discloses a system and a method for detecting the amount of foam in a household appliance, which have the following basic principles: the change of foam over time is reduced due to natural, wind or spray destruction. The ratio of the times of detecting the foam is calculated through multiple detections in a certain time, so that the aim of detecting the foam quantity is fulfilled. The detection system and the detection method have the advantages of simple structure and method, high accuracy in detecting the foam quantity and the change of the foam quantity, and provide a basis for processing the foam in the household appliance. And the effect is better when the detection is carried out after the drainage is finished. After the foam is broken, if water is continuously fed into the water cavity, the foam is probably generated again, and by the detection system and the detection method, the detected foam content can also be used for judging whether the foam is generated again subsequently.
Drawings
FIG. 1 is a timing diagram illustrating the timing of sending a detection signal according to the present invention;
FIG. 2 is a schematic diagram of the position of the foam sensor relative to the water level of the present invention;
FIG. 3 is a schematic structural diagram of a detection system for a drum washing machine according to an embodiment of the present invention;
FIG. 4 is a timing diagram illustrating a detection signal transmission according to a first embodiment of the present invention;
FIG. 5 is a flow chart of foam treatment according to an embodiment of the present invention.
Detailed Description
Hereinafter, a system and a method for detecting an amount of foam in a home appliance according to the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper", "lower", "bottom", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions and values used in the present embodiment are only for illustrating the technical solutions, and do not limit the protection scope of the present invention. The following embodiments are all exemplified by using the safety door lock of the present invention in a dishwasher, but it should be noted that the safety door lock of the present invention is not limited to be applied to a dishwasher.
The invention discloses a foam detection system for a household appliance, which comprises a household appliance body, a control subsystem and a foam sensor, wherein the foam sensor is arranged in the household appliance body and is connected to the control subsystem. The household appliance comprises a water cavity, and the foam sensor is arranged in the water cavity; or, an open container is arranged outside the water cavity, the container is communicated with the water cavity, and the foam sensor is arranged in the container. The control subsystem can be arranged in a foam sensor, and the foam sensor only feeds back the processed data to a main control system of the household appliance. The control subsystem can also be arranged in a main control system of the household appliance, the foam sensor feeds back original data to the main control system, and the main control system performs data processing. The foam sensor may employ an existing foam sensor, such as an optical foam sensor or the like.
Generally, the household appliance includes a drain pipe, and the foam sensor may also be installed in the drain pipe.
Preferably, the household appliance is a dishwasher, the dishwasher comprising a cup, the foam sensor being mounted in the cup.
To achieve better results, the foam sensor is installed at a default water level, as shown in fig. 2.
A method for detecting the amount of foam in a household appliance, comprising the steps of:
step 1) intermittently sending detection signals through a foam sensor, wherein the duration of each time of sending the detection signals is S as shown in figure 1 i ，i1, 2, … C, wherein C is more than or equal to 1; the interval time between every two times of sending the detection signal is T j ，j1, 2, 2, … C-1, wherein C is more than or equal to 1; at S i The number of times of sending the detection signal in time is recorded as M i ，i1, 2, … C, wherein C is more than or equal to 1; at S i The number of foam detected over time was recorded as N i ，i=1，2，…C，C≥1；
Step 2) calculating the foam amount, wherein the foam amount P = (N1 + N2+ … + N) i ）/（M1+M2+…+M i ）*100%.
Further, when C is not less than 2, S1=S2=…= S i . The continuous time of sending the detection signal every time is the same, the foam amount of single detection can be monitored in real time, the foam amount difference of each time is compared, particularly, the foam amount difference of two adjacent times can be judged, whether the foam has the situation of accelerated breakage or not can be judged, and the effect of accelerated breakage can be realized.
Further, when C is not less than 2, T1=T2=…=T j .
Example one
The present embodiment takes a drum washing machine as an example, and describes the system and method for detecting the amount of foam in a home appliance according to the present invention. Household appliances such as dishwashers can also be implemented with reference to the present embodiment.
As shown in FIG. 3, the system for detecting the foam amount of the drum washing machine comprises an inner drum 1, an outer drum 2 and a foam sensor 3 of the drum washing machine. Preferably, the foam sensor 3 is installed between the inner cylinder 1 and the outer cylinder 2, particularly at a position as high as a default water level. The foam sensor 3 is installed at the position, and the detection precision is high. If the installation position is lower, the sensitivity for detecting the foam is higher; if the installation position is higher, the detection device is mainly used for detecting the condition of excessive foam. Under most conditions, the height position of the clothes after drainage is close to the default water inlet position, and the position is suitable for detecting foam, so that certain sensitivity is ensured, and premature saturation is avoided.
The following examples of the detection method and the process of treating the foam are given:
as shown in fig. 4, after drainage or dewatering is completed, foam information is collected. The collection process is as follows: the foam sensor is used for intermittently sending detection signals, the duration of each time is 2 seconds, the frequency of the used alternating current is 50Hz, and the detection signals are sent 100 times in each detection period (2 seconds). The interval between every two transmissions of the detection signal (i.e. every two detection periods) is 8 seconds. The transmitted signal is summed for 5 periods. In the detection process, the foam quantity P detected in each period is recorded in real timei=N j /100*100%，i=1, 2, 3, 4, 5. After 5 cycles, the total foam amount P = (P)1+P2+P3+P4+P5）/5。
As shown in fig. 5, when washing/rinsing is completed and draining is completed, detection is started, and after the detection is completed, dehydration is started. The method of the invention mainly detects the condition of excessive foam, and after the dehydration is finished, the foam is less, and the detection is not sensitive. Judging the foam amount and carrying out corresponding treatment: before the last rinsing, detecting the amount of foam P, if P > a first threshold value L1And starting the bubble removing function, such as spraying, blowing, increasing water inflow and the like. Detecting the amount of foam P in the last rinsing, if P > L2The bubble removal function is turned on, such as adding 1 rinse or increasing the water intake.
In this embodiment, the foam sensor 3 may also be mounted in other locations, such as in the drain pipe 4. When the device is installed in the drain pipe 4, the sensitivity for detecting foam is high because the position of the drain pipe 4 is low, and the foam can be detected when the foam amount is small. If there is more foam, the detection is easily saturated.
The position of the water stored in the drum washing machine can be called as a water cavity 5, a container 6 can be additionally arranged, and the upper part of the container 6 is opened and is connected with the water cavity 5 through a connecting pipe. The foam sensor 3 may also be mounted in the container. Based on the principle of the communicating vessel, the water level in the container 6 is equal to the water level in the water cavity 5. The water flow in the container 6 is relatively static and is affected by the connecting pipe and is not the most suitable mounting location. But this location is advantageous for integrating other sensors such as turbidity sensors, hardness sensors, conductivity sensors, etc.
Based upon the foregoing description of the preferred embodiment of the invention, it should be apparent that the invention defined by the appended claims is not limited solely to the specific details set forth in the foregoing description, as many apparent variations thereof are possible without departing from the spirit or scope thereof.
Claims (9)
1. A foam detection system for a household appliance is characterized by comprising a household appliance body, a household appliance main control system and a foam sensor, wherein the foam sensor is installed in the household appliance body and is connected to a control subsystem.
2. Foam detection system for household appliances according to claim 1, characterized in that the household appliance comprises a water chamber, the foam sensor being mounted in the water chamber; or, an open container is arranged outside the water cavity, the container is communicated with the water cavity, and the foam sensor is arranged in the container.
3. Foam detection system for household appliances according to claim 1, characterized in that the household appliance comprises a drain pipe, the foam sensor being mounted inside the drain pipe.
4. The foam detecting system for the electric home appliance according to claim 1, wherein the electric home appliance is a drum washing machine including an inner drum, an outer drum, the foam sensor being installed between the inner drum and the outer drum.
5. The foam detection system for a household appliance according to claim 1, wherein the household appliance is a dishwasher, the dishwasher comprising a cup, the foam sensor being mounted within the cup.
6. The foam detection system for home appliances according to any one of claims 1 to 5, wherein the foam sensor mounting height is a default water inlet level.
7. A method for detecting the amount of foam in a household appliance, characterized in that it comprises the following steps:
step 1) intermittently sending detection signals through a foam sensor, wherein the duration of each time of sending the detection signals is S i ，i1, 2, … C, wherein C is more than or equal to 1; the interval time between every two times of sending the detection signal is T j ，j1, 2, 2, … C-1, wherein C is more than or equal to 1; at S i The number of times of sending the detection signal in time is recorded as M i ，i1, 2, … C, wherein C is more than or equal to 1; at S i The number of foam detected over time was recorded as N i ，i=1，2，…C，C≥1；
Step 2) calculating the amount of foam, wherein the amount of foam P = (N1 + N2+ … + N) i ）/（M1+M2+…+M i ）*100%。
8. The method for detecting the amount of foam in a home appliance according to claim 7, wherein S is set when C ≧ 21=S2=…= S i ；
The continuous time of sending the detection signal every time is the same, the foam amount of single detection can be monitored in real time, the foam amount difference of each time is compared, particularly, the foam amount difference of two adjacent times can be judged, whether the foam has the situation of accelerated breakage or not can be judged, and the effect of accelerated breakage can be realized.
9. Method for detecting the amount of foam in an electric household appliance according to claim 7, wherein T is T ≧ 21=T2=…=T j 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111369409.7A CN114098582B (en) | 2021-11-18 | 2021-11-18 | System and method for detecting foam quantity in household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111369409.7A CN114098582B (en) | 2021-11-18 | 2021-11-18 | System and method for detecting foam quantity in household appliance |
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| CN114098582A true CN114098582A (en) | 2022-03-01 |
| CN114098582B CN114098582B (en) | 2024-06-18 |
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2021
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| CN114098582B (en) | 2024-06-18 |
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