CN106948132A - Washing machine and the detergent liquid level detection device for washing machine - Google Patents
Washing machine and the detergent liquid level detection device for washing machine Download PDFInfo
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- CN106948132A CN106948132A CN201710174266.1A CN201710174266A CN106948132A CN 106948132 A CN106948132 A CN 106948132A CN 201710174266 A CN201710174266 A CN 201710174266A CN 106948132 A CN106948132 A CN 106948132A
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- level detection
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- 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
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/02—Devices for adding soap or other washing agents
- D06F39/022—Devices for adding soap or other washing agents in a liquid state
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- D06F2202/02—
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Abstract
A kind of detergent liquid level detection device the invention discloses washing machine and for washing machine, the washing machine includes detergent the storage box, detergent the storage box has U-type groove, the side of U-type groove is used to putting detergent, opposite side formation sealed gas chamber, and sealed gas chamber, provided with mouth is led, the detergent liquid level detection device includes：Level sensor, the pressure sensitive end of level sensor is connected to by muffler leads mouth, passes through the air pressure variations situation outputting inductance signal in induction seal air chamber；Liquid level detection unit, for inductance signal to be identified to detect the detergent liquid level in detergent the storage box.The device with detergent without being contacted, air pressure variations in detergent the storage box U-type groove in sealed gas chamber are perceived by level sensor, detergent liquid level can accurately and reliably be detected, avoid occurring due to detergent wall built-up or it is local assemble hardening and cause the inaccurate phenomenon of the detergent liquid level of detection, and cost is relatively low.
Description
Technical field
The present invention relates to washing machine technology field, more particularly to a kind of detergent liquid level detection device for washing machine and
A kind of washing machine.
Background technology
For delivering the washing machine of function automatically with detergent, it is necessary to be detected to detergent liquid level.
In correlation technique, detergent level sensing, i.e. switch mode or probe side are typically carried out by two ways
Formula.Wherein, switch mode is by setting a pillar in detergent the storage box, and switch being enclosed within into pillar
On, switch can fluctuate with the change of liquid level.Meanwhile, tongue tube is set in switch, and in detergent
Magnet is set at the specific level of the storage box, when switch with liquid level change and when moving up and down, in switch close to magnetic
It during iron, can close tongue tube, to export corresponding liquid level signal, thus detect the liquid level of detergent.However, due to washing
Agent detects detergent liquid level than denser, by this way it is possible that phenomenon of the switch wall built-up on pillar, so that
Cause switch not moved up and down with the change of liquid level, and then cause the detergent liquid level of detection inaccurate.
Probe mode be by detergent set two metal probes, controller be passed through+12V voltages to one of them
In metal probe, when two metal probes are all submerged in detergent, due to the electric conductivity of detergent, another metal can be made
Probe generation+12V voltage, detergent liquid level can be judged by the voltage for detecting another metal probe.However, the party
Formula not only needs controller to provide the+12V voltages of isolation, and cost is higher, and needs detergent as conductive carrier, if
Detergent long-term existence is not used in the storage box, and detergent is it is possible that local assemble hardening, so as to cause detection
Detergent liquid level differs larger with actual liquid level.
To sum up, above two detergent level sensing mode is all likely to occur the phenomenon of liquid level erroneous judgement.Therefore, how to provide
A kind of reliable detergent liquid level detection device, as those skilled in the art's urgent problem to be solved.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.
Therefore, it is an object of the present invention to propose a kind of detergent liquid level detection device for washing machine, the dress
Put without being contacted with detergent, the air in detergent the storage box U-type groove in sealed gas chamber is perceived by level sensor
Pressure change, you can accurately and reliably detect detergent liquid level, it is to avoid occur because detergent wall built-up or local assembly are hard
Change the phenomenon for causing the detergent liquid level of detection inaccurate, and cost is relatively low.
It is another object of the present invention to propose a kind of washing machine.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of detergent level sensing for washing machine
Device, the washing machine includes detergent the storage box, and the detergent the storage box has U-type groove, and the side of the U-type groove is used to
Putting detergent, the opposite side formation sealed gas chamber of the U-type groove, and the sealed gas chamber are provided with and lead mouth, the detergent
Liquid level detection device includes：Level sensor, the pressure sensitive end of the level sensor is connected to described lead by muffler
Mouth, the level sensor is by sensing the air pressure variations situation in the sealed gas chamber with outputting inductance signal；Liquid level
Detection unit, the liquid level detection unit is connected with the level sensor, and the liquid level detection unit is used for the inductance
Signal is identified to detect the detergent liquid level in the detergent the storage box.
Detergent liquid level detection device for washing machine according to embodiments of the present invention, is washed by level sensor sensing
The air pressure variations situation in agent the storage box in U-type groove sealed gas chamber is washed with outputting inductance signal, then passes through level sensing list
Inductance signal is identified to detect the detergent liquid level in detergent the storage box for member.Thus, the device without and detergent
Contacted, the air pressure variations in detergent the storage box U-type groove in sealed gas chamber are perceived by level sensor, you can be accurate
Really, detergent liquid level is reliably detected out, it is to avoid occur due to detergent wall built-up or local assemble hardening and cause washing for detection
The inaccurate phenomenon of agent liquid level is washed, and cost is relatively low.
In addition, the detergent liquid level detection device for washing machine proposed according to the above embodiment of the present invention can also have
There is following additional technical feature：
According to one embodiment of present invention, the liquid level detection unit includes：Oscillating circuit, the oscillating circuit and institute
State level sensor to be connected, the inductance signal that the oscillating circuit is used to export the level sensor is converted to frequency letter
Number；Microcontroller, the microcontroller is connected with the oscillating circuit, and the microcontroller is by judging the frequency signal
Size is to detect the detergent liquid level.
According to one embodiment of present invention, the level sensor includes rubber membrane, magnet and coil, wherein, in institute
When stating the air pressure in sealed gas chamber and changing, the rubber membrane is moved to drive the magnet to move, with
Toilet states magnet and cutting movement is done in the coil, and the inductance value of the coil is changed.
According to one embodiment of present invention, the oscillating circuit includes frequency-selective network feedback circuit and amplifying circuit, its
In, the frequency-selective network feedback circuit includes：First inductance；First electric capacity, one end of first electric capacity and the described first electricity
The Same Name of Ends of sense is connected；Second electric capacity, one end of second electric capacity is connected with the other end of first electric capacity, and described second
There is the first tie point between the other end of one end of electric capacity and first electric capacity, and first tie point is grounded, it is described
The other end of second electric capacity is connected with the different name end of first inductance.
According to one embodiment of present invention, the amplifying circuit includes：First resistor；First phase inverter, described first
The input of phase inverter is connected with one end of the first resistor, output end and the first resistor of first phase inverter
The other end is connected；Second phase inverter, second phase inverter is in parallel with first phase inverter；3rd phase inverter, the described 3rd
The input of the phase inverter other end respectively with the first resistor, the output end of first phase inverter and described second anti-phase
The output end of device is connected, and the output end of the 3rd phase inverter is connected by second resistance with the microcontroller.According to this hair
Bright one embodiment, the frequency-selective network feedback circuit also includes：3rd resistor, one end of the 3rd resistor and described the
One end of one electric capacity is connected, and the other end of the 3rd resistor is connected with one end of the first resistor；4th resistance, tells
One end of four resistance is connected with the other end of second electric capacity, and the other end of the 4th resistance is another with the first resistor
One end is connected.
According to one embodiment of present invention, the frequency-selective network feedback circuit also includes：First diode and the two or two
Pole pipe, the anode of first diode is connected with the negative electrode of second diode and with the second tie point, described second
Tie point is connected with one end of first electric capacity and one end of the 3rd resistor respectively, the negative electrode of first diode with
Default power supply is connected, the plus earth of second diode；5th resistance, one end of the 5th resistance connects with described second
Contact is connected, and the other end of the 5th resistance is connected with the negative electrode of first diode；3rd diode and the four or two pole
Pipe, the anode of the 3rd diode is connected with the negative electrode of the 4th diode and connected with the 3rd tie point, the described 3rd
Contact is connected with the other end of second electric capacity and one end of the 4th resistance respectively, the negative electrode of the 3rd diode with
Default power supply is connected, the plus earth of the 4th diode.
According to one embodiment of present invention, it is described to lead the top that mouth is arranged on the sealed gas chamber.
To reach above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of washing machine, and it includes above-mentioned washing
Agent the storage box and the detergent liquid level detection device for washing machine.
Washing machine according to embodiments of the present invention, is sensed by the level sensor of above-mentioned detergent liquid level detection device
Air pressure variations situation in detergent the storage box in U-type groove sealed gas chamber, with outputting inductance signal, then passes through level sensing
Inductance signal is identified to detect the detergent liquid level in detergent the storage box for unit.Thus, the washing machine passes through water level
Air pressure variations in sensor senses detergent the storage box U-type groove in sealed gas chamber, you can accurately and reliably detect to wash
Wash agent liquid level, it is to avoid occur due to detergent wall built-up or local assemble hardening and cause that the detergent liquid level of detection is inaccurate to be showed
As improving the reliability of work.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and be readily appreciated that, wherein,
Fig. 1 is the square frame signal of the detergent liquid level detection device according to an embodiment of the invention for washing machine
Figure；
Fig. 2 is the square frame signal of the detergent liquid level detection device in accordance with another embodiment of the present invention for washing machine
Figure；
Fig. 3 is the internal structure schematic diagram of level sensor according to an embodiment of the invention；
Fig. 4 is the external structure schematic diagram of level sensor according to an embodiment of the invention；
Fig. 5 is the square frame signal of the detergent liquid level detection device in accordance with another embodiment of the present invention for washing machine
Figure；
Fig. 6 is the circuit diagram of oscillating circuit according to an embodiment of the invention；
Fig. 7 is the circuit diagram of oscillating circuit in accordance with another embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Below with reference to the accompanying drawings come describe the detergent liquid level detection device for washing machine of embodiment of the present invention proposition with
Washing machine.Fig. 1 is the block diagram of the detergent liquid level detection device according to an embodiment of the invention for washing machine.
In an embodiment of the present invention, as shown in figure 1, washing machine can include detergent the storage box 10 and detergent liquid level
Detection means.Wherein, detergent the storage box 10 has U-type groove, and the side of U-type groove is used to putting detergent, the opposite side of U-type groove
Sealed gas chamber is formed, and sealed gas chamber leads the top that mouth 20 may be provided at sealed gas chamber provided with mouth 20 is led.
Detergent liquid level detection device includes：Level sensor 30 and liquid level detection unit 40.Wherein, level sensor 30
Pressure sensitive end 300 be connected to by muffler 50 and lead mouth 20, level sensor 30 passes through the air in induction seal air chamber
Pressure changing is with outputting inductance signal.Liquid level detection unit 40 is connected with level sensor 30, and liquid level detection unit 40 is used
In inductance signal is identified to detect the detergent liquid level in detergent the storage box 10.
Specifically, based on law of connected vessels, in putting detergent, detergent can submerge another from the dispensing side of U-type groove
The sealed gas chamber of side, so that the air pressure in sealed gas chamber can be made to change, wherein, with the increase of detergent liquid level,
Air pressure in sealed gas chamber can increase.Due to level sensor 30 pressure sensitive end 300 by muffler 50 with being connected
Lead mouth 20 to be connected, so level sensor 30 can sense the air pressure variations in sealed gas chamber.The basis of level sensor 30
Air pressure variations situation in sealed gas chamber exports corresponding inductance signal, and liquid level detection unit 40 to inductance signal by entering
Row conversion, processing, you can detect the detergent liquid level in detergent the storage box 10.
As a kind of example, for the washing machine with automatic detergent adding function, as shown in Fig. 2 can be in detergent
The bottom of the storage box 10 sets detergent delivery outlet 102, and the delivery outlet 102 can be connected to the peristaltic pump of washing machine by conduit.
The controller of washing machine is by the weight of fuzzy weighing technology automatic sensing clothing, the program for washing selected with reference to user, and
Temperature sensor built in synthesis judges that current environmental temperature adjusts the consumption of detergent, and Based Intelligent Control peristaltic pump squeezes lotion
Enter in demultplexer, so as to realize the intelligence dispensing of detergent, be truly realized full-automatic intelligent.Meanwhile, to prevent
Because the very few influence laundry effect of detergent in detergent the storage box 10, or detergent excessively cause showing for detergent spilling
As, it is necessary to be detected to the detergent liquid level in detergent the storage box 10, to enter when liquid level is relatively low or higher to user
Row is reminded.
Specifically, as shown in Fig. 2 user can add mouth 101 by detergent add and wash into detergent the storage box 10
Wash agent.When detergent liquid level changes in detergent the storage box 10, the air pressure in sealed gas chamber can change, level sensor
30 can sense the air pressure variations in sealed gas chamber.Level sensor 30 is according to the air pressure variations feelings in sealed gas chamber
Condition exports corresponding inductance signal, and liquid level detection unit 40 to inductance signal by being changed, being handled, you can detect washing
Detergent liquid level in agent the storage box 10.The detergent liquid level that controller can be detected according to liquid level detection unit 40, is being washed
Wash agent liquid level it is relatively low or higher when control corresponding Tip element to remind user, substantially increase the use body of user
Test.Thus, the device is perceived closed in detergent the storage box U-type groove without being contacted with detergent by level sensor
Air pressure variations in air chamber, you can accurately and reliably detect detergent liquid level, it is to avoid occur due to detergent wall built-up or
Person, which locally assembles hardening, causes the inaccurate phenomenon of the detergent liquid level of detection, and cost is relatively low.
Further, Fig. 3 is the internal structure schematic diagram of level sensor according to an embodiment of the invention.Such as Fig. 3
Shown, level sensor 30 can include rubber membrane 301, magnet 302 and coil (not specifically illustrated in figure).In sealed gas chamber
Air pressure when changing, rubber membrane 301 is moved to be moved with band moving magnet 302, so that magnet 302 is in coil
In do cutting movement, the inductance value of coil is changed.
Specifically, as shown in figure 3, level sensor 30 may also include vinyl cover 303, be oriented to plastic sheet 304 and fixed seat
305, wherein, coil can be arranged in fixed seat 305.After assembling, the external structure of level sensor 30 is as shown in Figure 4.
Wherein, the pressure sensitive end 300 of level sensor 301 is in the bottom of whole level sensor 30, by muffler 50 with washing
The mouth 20 of leading for washing agent the storage box 10 is connected.During detergent liquid level change in U-type groove, air pressure in sealed gas chamber can be with
Change so that the rubber membrane 301 for oppressing level sensor 30 is moved.When rubber membrane 301 is moved, it can drive and be arranged on
Magnet 302 (such as cylinder-shaped magnet) on rubber membrane 301 is moved, and magnet 302 does cutting movement, magnetic flux hair in coil
Changing, corresponding inductance signal changes.Liquid level detection unit 40 to inductance signal by being changed, being handled, you can
Accurately and reliably detect the detergent liquid level in detergent the storage box 10.
The level sensor make use of under air pressure effect, obtain corresponding by promoting magnet to do cutting magnetic line
Inductance signal, is not only simple in structure, and accuracy of detection is high.In addition, it is necessary to explanation, in an embodiment of the present invention, water
Level sensor 30 can also use other structures, and specific I will not elaborate.
Believe exporting corresponding inductance according to the air pressure variations situation in closed air chamber by level sensor 30
After number, liquid level detection unit 40 can obtain detergent liquid level, and level sensing list by being changed, being handled to the inductance signal
How member 40 is specific obtains detergent liquid level according to inductance signal, is illustrated with reference to the specific example of the present invention.
According to one embodiment of present invention, as shown in figure 5, liquid level detection unit 40 can include：The He of oscillating circuit 401
Microcontroller 402.Wherein, oscillating circuit 401 is connected with level sensor 30, and oscillating circuit 401 is used for level sensor 30
The inductance signal of output is converted to frequency signal；Microcontroller 402 is connected with oscillating circuit 401, and microcontroller 402 is by judging
The size of frequency signal is to detect detergent liquid level.
Specifically, liquid level lowest part and liquid level highest point in detergent the storage box 10 can be measured in advance by related experiment
The size of corresponding detergent liquid level and frequency signal, and it is stored in microcontroller 402.When microcontroller 402 receives vibration
During the frequency signal that circuit 401 is sent, according to corresponding proportionate relationship, you can calculate current detergent liquid level.Due to inductance
Signal and frequency signal can be with stepless changes, therefore the detergent liquid level that microcontroller 402 is measured is also stepless change.
Further, according to one embodiment of present invention, as shown in fig. 6, oscillating circuit 401 feeds back including frequency-selective network
Circuit 4011 and amplifying circuit 4012.
Wherein, frequency-selective network feedback circuit 4011 includes：First inductance L1, the first electric capacity C1 and the second electric capacity C2.First
C1 one end of electric capacity is connected with the first inductance L1 Same Name of Ends.Second electric capacity C2 one end and the first electric capacity C1 other end phase
Even, there is the first tie point Q1 between the second electric capacity C2 one end and the first electric capacity C1 other end, and the first tie point Q1 connects
Ground, the second electric capacity C2 other end is connected with the first inductance L1 different name end.
Amplifying circuit 4012 includes：First resistor R1, the first phase inverter A1, the second phase inverter A2 and the 3rd phase inverter A3.
First phase inverter A1 input is connected with first resistor R1 one end, and the first phase inverter A1 output end is with first resistor R1's
The other end is connected.Second phase inverter A2 is in parallel with the first phase inverter A1.3rd phase inverter A3 input respectively with first resistor
The R1 other end, the first phase inverter A1 output end are connected with the second phase inverter A2 output end, the 3rd phase inverter A3 output
End is connected by second resistance R2 with microcontroller 402.Wherein, the first phase inverter A1, the second phase inverter A2 and the 3rd phase inverter
A3 can be realized by CD4096 phase inverters.
Specifically, as shown in fig. 6, L1, C1 and C2 constitute the frequency-selective network feedback circuit 4011 of a π type, produce simultaneously
180 ° of phase shifts, and A1 and A2 can also produce 180 ° of phase shifts, so as to so that the phase shift of whole 360 ° of the generation of oscillating circuit 401, enters
And oscillating circuit 401 can be made to meet self-oscillatory phase equilibrium.And R1 effect is A1 and A2 is biased in high increasing
The linear amplification region of benefit, to constitute amplifier, so as to so that oscillating circuit 401 meets self-oscillatory amplitude balance condition.
Wherein, when the detergent liquid level in U-type groove changes, being delivered to the air pressure of level sensor 30 can also change, and oppress rubber
Glued membrane 301 is moved, with band moving magnet 302 move, and magnet enter the coil of level sensor 30 number, determine
L1 size.
When oscillating circuit 401 works, a disturbing signal can be produced in circuit, the signal contains a series of frequencies
Different sinusoidal component signals, required sinusoidal frequency signal is exported by frequency-selective network feedback circuit 4011, and the signal is amplified
After device amplification, the loop gain amplitude of whole circuit is | AuF | more than 1.With the increase of sinusoidal frequency signal, amplifier is put
Big multiple can be gradually reduced, whole loop | AuF | tend to 1, so that the whole fixed ampllitude of oscillating circuit 401 vibration, produces phase
The frequency signal answered.The size that microcontroller 402 passes through determination frequency signal, you can accurately and reliably detect detergent liquid
Position.
In addition, it is necessary to explanation, in the oscillating circuit 401 shown in Fig. 6, using two phase inverters (i.e. A1, A2) simultaneously
Connection, can be with the output driving ability of increasing circuit, and A3 is that signal is further processed, so that the frequency signal of output is more managed
Think.
In addition, it is contemplated that the delay of phase inverter can produce extra phase shift, so, in order to ensure the phase of oscillating circuit 401
Shifting meets self-oscillatory phase equilibrium, in one embodiment of the invention, as shown in fig. 7, frequency-selective network feedback electricity
Road 401 may also include：3rd resistor R3 and the 4th resistance R4.Wherein, 3rd resistor R3 one end and the first electric capacity C1 one end
It is connected, the 3rd resistor R3 other end is connected with first resistor R1 one end.4th resistance R4 one end is with the second electric capacity C2's
The other end is connected, and the 4th resistance R4 other end is connected with the first resistor R1 other end.
Specifically, 3rd resistor R3 and the 4th resistance R4 is current-limiting resistance, and major function is to limit the output of phase inverter.Reason
In the case of thinking, phase inverter can provide 180 ° of phase shift, but the intrinsic delay of phase inverter can produce extra phase shift, and should
Phase shift is proportional to intrinsic delay.Therefore, the phase shift to ensure whole oscillating circuit 401 is n*360 ° (n is 1,2,3 ...), choosing
Frequency network feedback circuit 4011 should be according to A1 and A2 delay situation there is provided the phase shift less than 180 °, by adjusting R3 and R4 i.e.
A1 and A2 can be made to provide the phase shift less than 180 °.When C1 and C2 is fixed, the loop gain of whole oscillating circuit 401 and phase shift can
Change as R3 and R4 changes, and if actual phase shift and loop gain meets self-oscillatory condition, then R3 and R4
It can ignore.
Further, the reliability worked for guarantee oscillating circuit 401, according to one embodiment of present invention, such as Fig. 7 institutes
Show, frequency-selective network feedback circuit 4011 can also include：First diode D1, the second diode D2, the 5th resistance R5, the three or two
Pole pipe D3 and the 4th diode D4.Wherein, the first diode D1 anode is connected with the second diode D2 negative electrode and with the
Two tie point Q2, the second tie point Q2 are connected with the first electric capacity C1 one end and 3rd resistor R3 one end respectively, the one or two pole
Pipe D1 negative electrode is connected with default power supply VCC, the second diode D2 plus earth.5th resistance R5 one end is connected with second
Point Q2 is connected, and the 5th resistance R5 other end is connected with the first diode D1 negative electrode.3rd diode D3 anode and the 4th
Diode D4 negative electrode is connected and with the 3rd tie point Q3, the 3rd tie point Q3 respectively with the second electric capacity C2 other end and the
Four resistance R4 one end is connected, and the 3rd diode D3 negative electrode is connected with default power supply VCC, and the 4th diode D4 anode connects
Ground.Wherein, the size for presetting power supply VCC can be+5V.
Specifically, D1 and D2 constitutes the first clamp circuit, the voltage of Q2 points is clamped between -0.7V~+5.7V, from
And overvoltage protection can be carried out to circuit.Similarly, D3 and D4 constitute the second clamp circuit, and the voltage for making Q3 points is clamped at-
Between 0.7V~+5.7V.R5 is current-limiting resistance, can carry out overcurrent protection to amplifying circuit 4012.Thus, it is possible to improve vibration
The safety and reliability of circuit.
In summary, the detergent liquid level detection device for washing machine according to embodiments of the present invention, is passed by water level
Air pressure variations situation in sensor sensing detergent the storage box in U-type groove sealed gas chamber is with outputting inductance signal, then passes through
Inductance signal is identified to detect the detergent liquid level in detergent the storage box for liquid level detection unit.Thus, the device without
It need to be contacted with detergent, the air pressure in detergent the storage box U-type groove in sealed gas chamber is perceived by level sensor
Change, you can accurately and reliably detect detergent liquid level, it is to avoid generation is assembled hardening due to detergent wall built-up or locally and led
The phenomenon for causing the detergent liquid level of detection inaccurate.
The embodiment of the present invention also proposes a kind of washing machine, and it includes above-mentioned detergent the storage box 10 and for washing machine
Detergent liquid level detection device.
Washing machine according to embodiments of the present invention, is sensed by the level sensor of above-mentioned detergent liquid level detection device
Air pressure variations situation in detergent the storage box in U-type groove sealed gas chamber is with outputting inductance signal, then passes through level sensing
Inductance signal is identified to detect the detergent liquid level in detergent the storage box for unit.Thus, the washing machine passes through water level
Air pressure variations in sensor senses detergent the storage box U-type groove in sealed gas chamber, you can accurately and reliably detect to wash
Wash agent liquid level, it is to avoid occur due to detergent wall built-up or local assemble hardening and cause that the detergent liquid level of detection is inaccurate to be showed
As improving the reliability of work.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicate or imply that the device or element of meaning must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (9)
1. a kind of detergent liquid level detection device for washing machine, it is characterised in that the washing machine is stored including detergent
Box, the detergent the storage box has U-type groove, and the side of the U-type groove is used to putting detergent, the opposite side of the U-type groove
Sealed gas chamber is formed, and the sealed gas chamber, provided with mouth is led, the detergent liquid level detection device includes：
Level sensor, the pressure sensitive end of the level sensor by muffler be connected to it is described lead mouth, the water level is passed
Sensor is by sensing the air pressure variations situation in the sealed gas chamber with outputting inductance signal；
Liquid level detection unit, the liquid level detection unit is connected with the level sensor, the liquid level detection unit be used for pair
The inductance signal is identified to detect the detergent liquid level in the detergent the storage box.
2. it is used for the detergent liquid level detection device of washing machine as claimed in claim 1, it is characterised in that the level sensing
Unit includes：
Oscillating circuit, the oscillating circuit is connected with the level sensor, and the oscillating circuit is used for the level sensor
The inductance signal of device output is converted to frequency signal；
Microcontroller, the microcontroller is connected with the oscillating circuit, and the microcontroller is by judging the frequency signal
Size to detect the detergent liquid level.
3. it is used for the detergent liquid level detection device of washing machine as claimed in claim 1 or 2, it is characterised in that the water level
Sensor includes rubber membrane, magnet and coil, wherein, when the air pressure in the sealed gas chamber changes, the rubber
Glued membrane is moved to drive the magnet to move, so that the magnet does cutting movement, the line in the coil
The inductance value of circle is changed.
4. it is used for the detergent liquid level detection device of washing machine as claimed in claim 2, it is characterised in that the oscillating circuit
Including frequency-selective network feedback circuit and amplifying circuit, wherein, the frequency-selective network feedback circuit includes：
First inductance；
First electric capacity, one end of first electric capacity is connected with the Same Name of Ends of first inductance；
Second electric capacity, one end of second electric capacity is connected with the other end of first electric capacity, one end of second electric capacity
There is the first tie point between the other end of first electric capacity, and first tie point is grounded, second electric capacity
The other end is connected with the different name end of first inductance.
5. it is used for the detergent liquid level detection device of washing machine as claimed in claim 4, it is characterised in that the amplifying circuit
Including：
First resistor；
First phase inverter, the input of first phase inverter is connected with one end of the first resistor, first phase inverter
Output end be connected with the other end of the first resistor；
Second phase inverter, second phase inverter is in parallel with first phase inverter；
3rd phase inverter, it is the input of the 3rd phase inverter other end respectively with the first resistor, described first anti-phase
The output end of device is connected with the output end of second phase inverter, and the output end of the 3rd phase inverter passes through second resistance and institute
Microcontroller is stated to be connected.
6. it is used for the detergent liquid level detection device of washing machine as claimed in claim 5, it is characterised in that the frequency-selective network
Feedback circuit also includes：
3rd resistor, one end of the 3rd resistor is connected with one end of first electric capacity, the other end of the 3rd resistor
It is connected with one end of the first resistor；
4th resistance, tells that one end of the 4th resistance is connected with the other end of second electric capacity, the 4th resistance it is another
End is connected with the other end of the first resistor.
7. it is used for the detergent liquid level detection device of washing machine as claimed in claim 6, it is characterised in that the frequency-selective network
Feedback circuit also includes：
First diode and the second diode, the anode of first diode are connected and had with the negative electrode of second diode
There is the second tie point, second tie point is connected with one end of first electric capacity and one end of the 3rd resistor respectively,
The negative electrode of first diode is connected with default power supply, the plus earth of second diode；
5th resistance, one end of the 5th resistance is connected with second tie point, the other end of the 5th resistance and institute
The negative electrode for stating the first diode is connected；
3rd diode and the 4th diode, the anode of the 3rd diode are connected and had with the negative electrode of the 4th diode
There are the 3rd tie point, the other end and one end phase of the 4th resistance of the 3rd tie point respectively with second electric capacity
Even, the negative electrode of the 3rd diode is connected with default power supply, the plus earth of the 4th diode.
8. it is used for the detergent liquid level detection device of washing machine as claimed in claim 1, it is characterised in that described to lead mouth setting
At the top of the sealed gas chamber.
9. a kind of washing machine, it is characterised in that including the detergent for washing machine as any one of claim 1-8
Liquid level detection device.
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| CN201710174266.1A CN106948132B (en) | 2017-03-22 | 2017-03-22 | Washing machine and detergent liquid level detection device for washing machine |
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| CN201710174266.1A CN106948132B (en) | 2017-03-22 | 2017-03-22 | Washing machine and detergent liquid level detection device for washing machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113796815A (en) * | 2020-06-15 | 2021-12-17 | 佛山市顺德区美的洗涤电器制造有限公司 | Dispensing device and dish washing machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130049969A1 (en) * | 2011-08-23 | 2013-02-28 | General Electric Company | Bulk dispenser fluid level sensing and out of balance detection for a washing machine appliance |
| CN103321021A (en) * | 2013-06-27 | 2013-09-25 | 无锡小天鹅股份有限公司 | Washing machine and detergent-box component thereof |
| CN104878570A (en) * | 2015-05-29 | 2015-09-02 | 南京创维家用电器有限公司 | Washing machine with detergent residual amount detecting function and detecting method |
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2017
- 2017-03-22 CN CN201710174266.1A patent/CN106948132B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130049969A1 (en) * | 2011-08-23 | 2013-02-28 | General Electric Company | Bulk dispenser fluid level sensing and out of balance detection for a washing machine appliance |
| CN103321021A (en) * | 2013-06-27 | 2013-09-25 | 无锡小天鹅股份有限公司 | Washing machine and detergent-box component thereof |
| CN104878570A (en) * | 2015-05-29 | 2015-09-02 | 南京创维家用电器有限公司 | Washing machine with detergent residual amount detecting function and detecting method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113796815A (en) * | 2020-06-15 | 2021-12-17 | 佛山市顺德区美的洗涤电器制造有限公司 | Dispensing device and dish washing machine |
| CN113796815B (en) * | 2020-06-15 | 2023-03-07 | 佛山市顺德区美的洗涤电器制造有限公司 | Dispensing device and dish washing machine |
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| CN106948132B (en) | 2019-05-21 |
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Effective date of registration: 20190807 Address after: 214028 No. 18 Changjiang South Road, Wuxi National High-tech Development Zone, Jiangsu Province Patentee after: Wuxi Swan Electrical Appliances Co., Ltd. Address before: 214028 Wuxi Changjiang Road, New District, Jiangsu, No. 18 Patentee before: Wuxi Xiaotianer Co., Ltd. |