CN101487730B - Water level detection method and apparatus for washing machine - Google Patents
Water level detection method and apparatus for washing machine Download PDFInfo
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- CN101487730B CN101487730B CN2008100007611A CN200810000761A CN101487730B CN 101487730 B CN101487730 B CN 101487730B CN 2008100007611 A CN2008100007611 A CN 2008100007611A CN 200810000761 A CN200810000761 A CN 200810000761A CN 101487730 B CN101487730 B CN 101487730B
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Abstract
The invention relates to a method for detecting water level of a washing machine and a device thereof; a capacitance type sensor composed of a PCB substrate and a metal sheet is used for detecting the water level in the water holding drum of the washing machine; the metal sheet is tightly attached to the external wall of the communicating part communicated with the water holding drum of the washing machine or directly attached to the external wall of the water holding drum. The capacitance type sensor is capable of sensing the change of the water level to change capacitance thereof; and a control unit is used for detecting and processing the capacitance of the capacitance type sensor so as to calculate the height of the water level and control the water level. By adopting the capacitance type sensor, the device can sense the slight strain on the communicating part or on the external wall of the water holding drum resulted from the change of water level, therefore, the method has the advantages of more accurate water level detection, high stability, simple structure and low cost as the sensor mainly consists of the PCB and metal sheet.
Description
Technical field
The present invention relates to a kind of washing machine, particularly a kind of washing machine level testing methods and device thereof, can more accurately detect washing machine be filled with water the tube in a water level.
Background technology
Washing machine comprises body, door, tube, clothing tube, driving and control system are filled with water; Door is positioned at front or the end face of body to open and close; The tube that is filled with water is fixed in the body through hitch, is the cylindrical shape of opening towards door, and the clothing tube is installed in the tube that is filled with water; Drive system is wiped the driving motor rotation, whole washing process of control system control washing machine.
Washing machine all is an Automatic Control at present; The user is as long as put into washing clothes in the clothing tube; Choose mode of washing, and press starting switch, washing machine can detect the washings amount in the clothing tube that is placed into automatically by the washings amount detecting device; Automatically add the water that is complementary with the washings amount again, just begin whole washing process then.
In order to make inflow reach the water level that is complementary with the washings amount, in existing washing machine, be to utilize the pressure transducer detection to put into the water level of the water of the tube that is filled with water; Like number of patent application is 200410059262.1 Chinese invention patent " tumbling-box washing machine with water level detecting unit ", just discloses a kind of water level detecting unit of tumbling-box washing machine, and it comprises the level sensor flexible pipe; Its suction tube position that is connected to drainage pump of washing machine also comprises level switch so that be communicated with the tube that is filled with water, and is installed in the upper end of level sensor flexible pipe; Be used for the air pressure of sensed water level sensing flexible pipe and the water level that is contained in the water in the tube that is filled with water; The level sensor flexible pipe comprises large-diameter portion and minor diameter, in the upper end of minor diameter level switch is installed, and large-diameter portion is connected to the lower end of minor diameter; Large-diameter portion is communicated with the bottom of the tube that is filled with water through the suction tube and the drainpipe of unwatering pump; So when being infeeded in the tube that is filled with water when water, the water level of large-diameter portion also can be along with increase, when the water level of large-diameter portion increases; Air in the level sensor flexible pipe is compressed; Pressure in the level sensor flexible pipe increases, the variation of level switch detected pressures, thus detect the water level that is contained in the water in the tube that is filled with water.
Thisly utilize the air pressure in the level switch sensed water level sensing flexible pipe and detect the method for the water level in the tube that is filled with water; Precision is lower; It receives the influence of environment bigger, and the vibrations of washing machine and the foreign material in it all can influence the accuracy of detection of level switch, especially for the detection than low-water level; Just more inaccurate, cost is also higher in addition.
In addition, the condenser type of employing condensate tank of dehumidifier being arranged also in the prior art, is the Chinese patent of ZL01231098.0 like the patent No.; Just disclose a kind of " condenser type condensate tank of dehumidifier ", it will be enclosed with the metallic conductor of insulation course as level sensor, and this level sensor vertically is installed in the water tank that needs sensed water level; Its big can be arranged in water tank; Ground wire is connected in water tank, forms an ability following water-level lifting between level sensor and the water and the electric capacity that changes, will be transformed into the continually varying electric signal with the electric capacity of SEA LEVEL VARIATION through electronic circuit; Be input to other control circuit, thereby realize the water level detecting in the water tank.This level sensor need be placed in the water in the water tank to be detected, wants the placing clothes tube because washing machine is filled with water in the tube, will place washing clothes in the clothing tube, so this kind condensate tank of dehumidifier is not suitable for washing machine.
In household appliances, bring into use touch key-press at present gradually; Touch key-press is to utilize capacitive touch control plate, and the principle of work of capacitive touch control plate is to come the position of perception finger through the electric capacity of human body, promptly arrives the moment of Trackpad when user's finger contacts; Just produced an electric capacity on the surface of plate; Trackpad is connected with a height integrated chip, follows the tracks of " track " that the user points electric capacity continuously, thereby accurately confirms the position of finger through inner a series of processing.This capacitance touching control plate technique adopted in fields such as mobile phone and notebook computers a lot of years, as long as just touching, it can respond to, and also stable performance, the mechanical test long service life.
Summary of the invention
Fundamental purpose of the present invention is to address the above problem, and a kind of level testing methods of brand-new washing machine is provided, and it is sensed water level more accurately, and stability is high, and cost is low.
Another object of the present invention is, a kind of pick-up unit of realizing above-mentioned washing machine level testing methods is provided, and simple in structure, cost is low.
For realizing the foregoing invention purpose; A kind of washing machine level testing methods is provided in the present invention; Its utilizes the test using capacitance sensor washing machine of being made up of PCB substrate and a sheet metal interior water level that is filled with water; Said sheet metal is fixed on the said PCB substrate, and said PCB substrate and sheet metal are formed the loop through line and control module, and this method comprises the steps:
With said sheet metal be close to washing machine be filled with water tube or with the outer wall of the connected component that is connected of tube that is filled with water on;
When the SEA LEVEL VARIATION in said be filled with water tube or the said connected component, said sheet metal is responded to the variation of water level, correspondingly changes the capacitance of said capacitance type sensor;
Detect above-mentioned capacitance through said control module, calculate the height of water level, thus the water level of control washing machine.
Be to realize another object of the present invention, a kind of device of aforesaid washing machine level testing methods of realizing comprises: one with a washing machine connected component that is communicated with that is filled with water; A capacitance type sensor, capacitance type sensor comprise a PCB substrate, wherein are fixed with sheet metal, and said sheet metal is close on the outer wall of said connected component, are used to detect the SEA LEVEL VARIATION of said connected component; A control module is used to detect and handle the capacitance of said capacitance type sensor, calculates the height of a said interior water level that is filled with water with this, thus control water level.
Said connected component be connected washing machine be filled with water the tube lowest water level or following place, as can connected component being connected the upstream end of draining valve in the washing machine drainage pipeline.
The another kind of device of aforesaid washing machine level testing methods of realizing of the present invention comprises: a capacitance type sensor; Capacitance type sensor comprises a PCB substrate; Wherein be fixed with sheet metal; Said sheet metal is close to said washing machine and is filled with water on the outer wall of tube, is used to detect the SEA LEVEL VARIATION of the said tube that is filled with water; A control module is used to detect and handle the capacitance of said capacitance type sensor, calculates the height of a said interior water level that is filled with water with this, thus control water level.
Said capacitance type sensor is connected fixing through the mode of clamping and/or the mode of glue with the outer wall of the said connected component or the tube that is filled with water.
Control module according to the invention comprises that one is used for the capacitance that detects is converted into the voltage value signal processing unit, an amplifier, a shaping circuit, and computer controller.
Content to sum up, described washing machine level testing methods and device thereof are owing to adopted capacitance type sensor; It can respond to the small strain that be filled with water tube or the outer wall of connected component produce owing to SEA LEVEL VARIATION; Sensed water level is more accurate, and stability is high, and is simple in structure; And sensor mainly is to be made up of PCB substrate and sheet metal, and cost is also lower.
In addition, if the present invention is used on the washing machine that has touch key-press, it can utilize the unnecessary chip mouth of the original touch key-press chip of washing machine to handle the detection of SEA LEVEL VARIATION simultaneously, further reduces cost.
Description of drawings
Fig. 1 is the washing machine structure synoptic diagram of an embodiment of the present invention;
Fig. 2 is the washing machine structure synoptic diagram of the another kind of embodiment of the present invention;
Fig. 3 is a control module synoptic diagram of the present invention;
Fig. 4 is the structural representation of capacitance type sensor of the present invention.
Extremely shown in Figure 4 like Fig. 1, capacitance type sensor 1, the tube 2 that is filled with water, connected component 3, control module 4; Discharge pipe line 5, PCB substrate 6, sheet metal 7, the body 8 of washing machine, motor 9; Clothing tube 10, draining valve 11, door 12, supply channel 13, water intaking valve 14; Signal processing unit 41, amplifier 42, shaping circuit 43, computer controller 44.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail: as shown in Figure 1, washing machine comprises body 8, door 12, be filled with water tube 2, clothing tube 10, driving and control system, and door 12 is positioned at the front of body 1; The tube 2 that is filled with water is fixed in the body 8 through hitch, is the cylindrical shape of opening towards door 12, and clothing tube 10 is installed in the tube 2 that is filled with water; Open clothing that door 12 just can input will be washed in clothing tube 10 perhaps with its taking-up; 9 rotations of drive systems motor, for pulsator washing machine, motor 9 just can drive the impeller rotation in the clothing tube 10; For tumbling-box washing machine; Motor 9 just can drive 10 rotations of clothing tube, thus the clothing in the washing clothes tube 10, whole washing process of control system control washing machine; According to the water level that detects by control module 4, laundry amounts and the program for washing set according to the user, Automatic Control program for washing.
During laundry; At first open door 12, in clothing tube 10, drop into the clothing that needs washing, drop into washing powder in the washing powder input port on being located at supply channel 13 then; The energized switch; From being located at the kind select operating mode of washing machine body 8 lip-deep setup units according to washings, import the instruction of start-up operation, the washing machine control system promptly begins to control whole operating process.
Washing machine tube 2 the top that is filled with water is connected to supply channel 13; Be used in the tube 2 that is filled with water, infeeding the required washings of washing; Tube 2 the bottom that is filled with water is connected to discharge pipe line 5; Discharge pipe line 5 is to be used for when washing process finishes, will being filled with water washings discharge in the tube 2, on discharge pipe line 5, is provided with a draining valve 11, on inlet pipeline 13, is provided with a water intaking valve 14.
After program for washing starts; At first to detect the laundry amounts of putting in the clothing tube 10; Open water intaking valve 14 then, in the tube 2 that is filled with water, infeed the washings that are mixed with washing powder through supply channel 13, water inlet lasts till that always water reaches till the water level that is complementary with detected laundry amounts.
One embodiment of the invention; As shown in Figure 1; In order accurately to detect the washing machine water level in the tube 2 that is filled with water; Especially in order more accurately to detect lower water level in the tube 2 that is filled with water; On the discharge pipe line 5 between freeing port and the draining valve 11 of tube 2 bottoms that be filled with water, be communicated with a connected component 3, the water level in the tube 2 that is filled with water just variation can cause that the corresponding height of the water level in the connected component 3 changes, so just can correspondingly determine the washing machine tins 2 interior water levels that are filled with water as long as detect water levels in the connected component 3.
Wherein connected component 3 also can not be arranged on the discharge pipe line 5, but directly is connected on the barrel at tube 2 the lowest water level place that is filled with water.
The present invention is provided with a capacitance type sensor 1, and this sensor 1 is to comprise a PCB substrate 6, is fixed with sheet metal 7 on it; Common metal sheet 7 adopts copper sheet, can respond to as long as touch, and is stable and reliable for performance; The mechanical test long service life, in addition, sensor mainly is to be made up of a PCB substrate 6 and sheet metal 7; Element is few, and cost is also lower.
Another kind of embodiment of the present invention, as shown in Figure 2, can capacitance type sensor 1 directly be attached on the outer wall of the tube 2 that is filled with water, detection method is as stated.In order to cooperate the tube 2 that is filled with water of different shape, PCB substrate 6 can be made soft-circuit board, makes sheet metal 7 fully to be close to be filled with water on the outer wall of tube 2, guarantees the degree of accuracy that detects.
Through the line on sheet metal 7 and the PCB substrate 6, the capacitance of above-mentioned generation is transferred to control module 4, detect the variation of above-mentioned capacitance by control module 4, and the corresponding height that calculates water level, thereby the water level of control washing machine.
As shown in Figure 2, be provided with signal processing unit 41 in the control module 4, amplifier 42, shaping circuit 43, computer controller 44.Signal processing unit 41 is used for converting detected capacitance into the correspondent voltage value, through amplifier 42 and shaping circuit 43, signal is transferred to computer controller 44, calculates corresponding water level by computer controller 44, further control water level.
When the water level in washing machine is filled with water tube 2 did not reach designated water level, water intaking valve 14 was opened always, and when water level reached designated water level, control module 4 will send steering order water intaking valve 14 is closed, thereby stopped in the tube 2 that is filled with water, to supply water.At this moment, joining the water of tube in 2 that are filled with water can be absorbed by the clothings in the clothing tube 10, and the water levels in the tube 2 that is filled with water can descend, therefore, also need with above identical method replenish water inlet, up to the water level that reaches regulation fully.
After the water level in the tube 2 that is filled with water reached predetermined water level, washing machine just can begin washing procedure, and after washing operation was accomplished, the tube 2 following draining valves 11 that are filled with water will be opened, and the washings in the tube 2 that is filled with water are discharged, and then carry out dehydrating operations.
Carried out once more draining valve 11 cutting out behind the official hour at dehydrating operations, opened water intaking valve 14, in the tube 2 that is filled with water, added new water, begun to carry out rinse operation.
After the rinse operation of having carried out the stipulated time, carry out dehydrating operations again, said process repeatedly is all over last powered-down switch, end operation to all laundry operations processes.
Capacitance type sensor 1 can be connected fixing with the outer wall of the connected component 3 or the tube 2 that is filled with water through the mode of clamping; As can on the outer wall of the connected component 3 or the tube 2 that is filled with water, a plurality of buckle (not shown) be set; Capacitance type sensor 1 card is placed in the buckle, thus with capacitance type sensor 1 be close to connected component 3 or the outer wall of the tube 2 that is filled with water on.
In addition, capacitance type sensor 1 also can be coated with gluing on the edge of PCB substrate 6, the mode through glue be fixed on connected component 3 or the outer wall of the tube 2 that is filled with water on, can certainly above-mentioned two kinds of fixed forms be used simultaneously.
The present invention can not be only applicable to roller washing machine, also is applicable to rotary drum washing machine, if when directly being affixed on capacitance type sensor 1 on tube 2 the outer wall that is filled with water; Also can a plurality of capacitance type sensors 1 be set parallel connection; Detecting like this can be more accurate, in addition, if one of them damage; Other also can continue use, can not influence the normal use of washing machine.
No matter capacitance type sensor 1 is to be affixed on connected component 3 or to be affixed on the outer wall of the tube 2 that is filled with water, and all will make the minimum point of the sheet metal 7 on it be positioned at or is lower than the desired lowest water level of washing machine place.
As stated, in conjunction with accompanying drawing and the given scheme content of embodiment, can derive the similar techniques scheme.In every case be the content that does not break away from technical scheme of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (6)
1. washing machine level testing methods; It is characterized in that: its utilizes the capacitance type sensor of being made up of PCB substrate (6) and sheet metal (7) (1) to detect washing machine tin (2) the interior water level that is filled with water; Said sheet metal (7) is fixed on the said PCB substrate (6); Said PCB substrate (6) and sheet metal (7) are formed the loop through line and control module (4), and this method comprises the steps:
Said sheet metal (7) is close on the outer wall of the connected component (3) that washing machine is filled with water tin (2) or be connected with the tube (2) that is filled with water;
When the SEA LEVEL VARIATION in said be filled with water tube (2) or the said connected component (3), said sheet metal (7) is responded to the variation of water level, correspondingly changes the capacitance of said capacitance type sensor (1);
Detect above-mentioned capacitance through said control module (4), calculate the height of water level, thus the water level of control washing machine.
2. device of realizing washing machine level testing methods as claimed in claim 1, it is characterized in that: comprise a capacitance type sensor (1), said capacitance type sensor (1) comprises a PCB substrate (6), is fixed with sheet metal (7) on it; Also comprise a control module (4), be used for detecting and handling the capacitance of said capacitance type sensor (1), calculate the height of said tube (2) the interior water level that is filled with water with this, thus control water level;
Said sheet metal (7) is close to said washing machine and is filled with water on the outer wall of tube (2), is used to detect the SEA LEVEL VARIATION of the said tube (2) that is filled with water;
Or said sheet metal (7) is close to said washing machine and is filled with water on the outer wall of the connected component (3) that is communicated with of tube (2), is used to detect the SEA LEVEL VARIATION of said connected component (3).
3. washing machine condensate tank of dehumidifier according to claim 2 is characterized in that: said capacitance type sensor (1) is connected fixing through the mode of clamping and/or the mode of glue with the outer wall of the said connected component (3) or the tube (2) that is filled with water.
4. washing machine condensate tank of dehumidifier according to claim 2; It is characterized in that: said control module (4) comprises that one is used for the capacitance that detects is converted into voltage value signal processing unit (41); An amplifier (42), a shaping circuit (43), and computer controller (44).
5. washing machine condensate tank of dehumidifier according to claim 2 is characterized in that: said connected component (3) be connected washing machine be filled with water the tube (2) lowest water level or following place.
6. washing machine condensate tank of dehumidifier according to claim 5 is characterized in that: said connected component (3) is connected the upstream end of draining valve (11) in the washing machine drainage pipeline (5).
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| CN2008100007611A CN101487730B (en) | 2008-01-16 | 2008-01-16 | Water level detection method and apparatus for washing machine |
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| CN2008100007611A CN101487730B (en) | 2008-01-16 | 2008-01-16 | Water level detection method and apparatus for washing machine |
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| CN101487730B true CN101487730B (en) | 2012-04-04 |
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| CN102235905A (en) * | 2011-04-08 | 2011-11-09 | 海尔集团公司 | Method for correcting error frequency of water level sensor on washing machine |
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| CN108893934B (en) * | 2018-08-30 | 2019-10-18 | 珠海格力电器股份有限公司 | Outer cylinder, drum assembly and roller washing machine |
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| CN114645441B (en) * | 2020-12-17 | 2023-09-19 | 广州视源电子科技股份有限公司 | Clothes care machine |
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Effective date of registration: 20160708 Address after: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Patentee after: Qingdao Haier Washing Machine Co., Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Qingdao hi tech Industrial Park, Shandong Patentee before: haier group corporation Patentee before: Qingdao Haier Washing Machine Co., Ltd. |