CN103776076B - Use the full-automatic continuous adjustable range hood of capacitance type sensor - Google Patents
Use the full-automatic continuous adjustable range hood of capacitance type sensor Download PDFInfo
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- CN103776076B CN103776076B CN201410039989.7A CN201410039989A CN103776076B CN 103776076 B CN103776076 B CN 103776076B CN 201410039989 A CN201410039989 A CN 201410039989A CN 103776076 B CN103776076 B CN 103776076B
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Abstract
The present invention uses the full-automatic continuous adjustable range hood of capacitance type sensor, including lampblack absorber housing, and is arranged on the capacitance type sensor in lampblack absorber housing, blower fan and speed-regulating control circuit；Capacitance type sensor includes that inside is provided with the first chamber and the noumenal seat of the second chamber, and the sensor housing coordinated with noumenal seat；The bottom of the first chamber and the second chamber is connected, and inside is filled with liquid insulating medium；The height of the first chamber is more than the height of the second chamber, and the liquid level sectional area of liquid insulating medium is less than the liquid level sectional area of the second chamber；Air air inlet that first chamber is arranged by top and atmosphere, internal be provided with the parallel relative battery lead plate of two panels along short transverse；The flue air inlet that second chamber is arranged by top connects with common flue；Battery lead plate is connected with the input of speed-regulating control circuit as the outfan of capacitance type sensor, and the outfan of speed-regulating control circuit is connected with motor, and the outfan of blower fan connects with common flue.
Description
Technical field
The present invention relates to a kind of range hood, be specially the full-automatic continuously adjustabe using capacitance type sensor
Formula range hood.
Background technology
High residential building range hood uses " fume tube type " to design mostly now, and i.e. tens users share one
Bar common flue, flue gas moves upward all the time in theory, and the oil smoke of each user can be arranged along common flue
Go out.But, using peak period at range hood, substantial amounts of oil smoke is discharged into common flue in the same time,
These oil smoke can cause retardance after flue middle and long distance moves, thus common flue internal pressure increases,
Make smoke discharging effect the best.
The exhaust air rate needing lampblack absorber in the case of this smoke discharging effect is the best can adapt to public cigarette automatically
The pressure change in road, but existing range hood rotating speed is often user oneself to be controlled, it is impossible in time
Regulation.And the regulation stall of range hood is fixed, it is impossible to well adapt to the use environment of reality.
The sensor that existing employing is general just can realize the detection to the change of common flue pressure, but
Existing pressure transducer is mainly made up of elastic sensing element and displacement sensing element, elastic sensing element
Make to be converted to displacement or dependent variable by measuring pressure, be converted into by displacement sensing element linear with pressure afterwards
The signal of telecommunication of relation.This sensor is not applied in oil smoke surroundings, and elastic sensing element surface is damaged
Go bad or speckle with oil smoke spot, will be unable to normally use, cause functional inefficacy.
Summary of the invention
For problems of the prior art, the present invention provides and uses automatically connecting of capacitance type sensor
Continuous adjustable cooker hood, it is possible to adapt to flue pressure, it is achieved the adaptability stepless-adjustment of range hood rotating speed
Joint, it is ensured that discharge fume smooth and easy.
The present invention is to be achieved through the following technical solutions:
The present invention uses the full-automatic continuous adjustable range hood of capacitance type sensor, including oil smoke casing
Body, and it is arranged on the capacitance type sensor in lampblack absorber housing, by motor-driven blower fan and control electricity
The speed-regulating control circuit of machine；Described capacitance type sensor includes that inside is provided with the first chamber and the second chamber
Noumenal seat, and the sensor housing coordinated with noumenal seat；The bottom phase of the first chamber and the second chamber
Connection, inside is filled with liquid insulating medium；The height of the first chamber is more than the height of the second chamber, liquid
The liquid level sectional area of body dielectric is less than the liquid level sectional area of the second chamber；First chamber is set by top
The air air inlet put and atmosphere, inside is provided with the parallel relative battery lead plate of two panels along short transverse；
The flue air inlet that second chamber is arranged by top connects with common flue；Battery lead plate passes as condenser type
The outfan of sensor is connected with the input of speed-regulating control circuit, the outfan of speed-regulating control circuit and motor
Connecting, the outfan of blower fan connects with common flue.
Preferably, air air inlet is arranged on the side of the first chamber, and is arranged on the first chamber by homonymy
Passage on the sidewall of room and the first chamber；The first leakproof rod member it is inserted with in air air inlet, the
One leakproof rod member lower end is sequentially connected with the first compression spring and the first pole being coaxially disposed.
Further, it is sequentially connected with insulation board bottom battery lead plate and is fixedly connected on the fixing of the first cavity bottom
Chassis.
Preferably, flue air inlet is arranged on the side of the second chamber；And it is arranged on the second chamber by homonymy
Passage on the sidewall of room and the second chamber；The second leakproof rod member it is inserted with in flue air inlet, the
Two leakproof rod member lower ends are sequentially connected with the second compression spring and the second pole being coaxially disposed.
Further, the second chamber side is provided with inlet and overfall, and bottom is provided with leakage fluid dram；Enter
The position of liquid mouth is higher than the balance liquid level of liquid insulating medium, and overfall is arranged on the flat of liquid insulating medium
Weighing apparatus position.
Further, the second chamber lower portion is inwardly indented formation breach, and the height of breach is situated between less than fluid insulation
Matter minimum liquid level in the second chamber；Installing plate is set in breach, installing plate is provided with for and passes
The installing hole that sensor housing connects.
Preferably, speed-regulating control circuit includes for the capacitance variations value of capacitance sensor is converted to voltage
The operation amplifier circuit of signal, be connected in turn operation amplifier circuit outfan speed regulator and
Thyristor voltage regulation circuit, and it is arranged on the speed feedback circuit of motor output end；Thyristor voltage regulation circuit
Outfan be connected with the control end of motor；The feedback signal of speed feedback circuit is through electric with operational amplifier
The output signal on road is input in speed regulator after subtracting computing.
Further, operation amplifier circuit includes operational amplifier and fixed capacity, the electric capacity of fixed capacity
Value C is equal to the capacitance C of capacitance sensorXMaximum；One input end grounding of operational amplifier,
Connect with capacitance sensor after another input parallel connection fixed capacity.
Preferably, liquid insulating medium uses transformer oil, described motor to use monopole asynchronous motor.
Compared with prior art, the present invention has a following useful technique effect:
The first chamber and the second chamber that the present invention is connected by bottom are respectively induced atmospheric pressure and flue pressure
Power, and the liquid level difference brought by level change reflects both pressure differentials, by by parallel relative
Battery lead plate inserts in liquid insulating medium, on the premise of not affecting liquid surface lifting, carrys out perception meniscus liquid
The height change of dielectric；The change of liquid level will make interelectrode capacitance size change, by between battery lead plate
The change of the reacting condition liquid level of capacitance, thus embody the change of air pressure；Utilize Jie of liquid
Electric constant and the bigger characteristic of air difference, even small level change also is able to cause capacitance
Change, it is possible to also assures that higher precision while realizing continuous control, not only realize the suction to oil smoke
Remove, but also rotating speed can be automatically adjusted according to pressure change and reach energy-conservation purpose；And air and flue
Gas does not directly contact with sensing element, will not bring oil smoke spot, it is ensured that service life and work are steady
Qualitative, it is to avoid the situation of oil smoke suck-back occurs in common flue pressure when increasing, it is ensured that lampblack absorber suitable
Smooth smoke evacuation.
Further, the passage by arranging at sidewall ensure that air pressure is effectively incorporated into correspondence
In chamber, and utilize leakproof rod member, compression spring and the pole being arranged in corresponding air inlet, at electricity
Hold sensor installing or when toppling over, leakproof rod member under the restoring force of spring and the effect of self gravitation to
Lower motion, the passage that leakproof rod member and air inlet offset and seal on sidewall, thus prevent intraluminal fluid
Body flows out.And avoid compression spring and leak into the contact of liquid insulating medium in air inlet by pole,
Prevent compression spring be affected because releasing performance with it for a long time or damage, extend its service life.
Further, by arranging of insulation board, electrode is separated with other conductive materials, it is ensured that sensing
Precision, by utilizing fixed underpan to be fixedly installed in the first chamber by electrode easily, and side
Just safeguard, change and overhaul.
Further, can inject liquid easily by the inlet arranged, leakage fluid dram discharges liquid,
And utilize the overfall being arranged on liquid insulating medium equilibrium position to be avoided by inlet note incoming and outgoing
Liquid mouth is discharged and is regulated liquid level back and forth, when overfall has liquid to overflow, illustrates that liquid has reached balance position
Putting, topping up can terminate, and Liquid level is accurate.
Further, owing to the liquid level sectional area of the second chamber is big, therefore under differential pressure action, liquid level
Fall is little, reduces cross section by its underpart arranges breach, on the one hand decreases the charging amount of liquid,
The most also provide space for the installation with sensor housing, reduce volume and the quality of entirety,
Take up room little, flexible for installation, wide adaptability.
Further, by control circuit, the output signal of capacitance sensor is converted to voltage signal, from
And realize processing and have adjusted the direct control to motor, and speed feedback circuit is utilized to ensure that the standard of speed governing
Really property and real-time control characteristic, working stability.
Further, by operation amplifier circuit, the signal of capacitance sensor is changed, and defeated
Go out voltage and its electric capacity linear proportional, simplified computing, improve response speed simultaneously, it is ensured that adjust
Joint precision and control accuracy.
Accompanying drawing explanation
Fig. 1 is the structural representation of range hood described in present example.
Fig. 2 is the sectional view of the capacitance sensor in structure described in present example.
Fig. 3 is the top view of Fig. 2 partial cutaway.
Fig. 4 is the circuit diagram of the operation amplifier circuit in structure described in present example.
Fig. 5 is the static structure figure of the speed-regulating control circuit in structure described in present example.
In figure: the first chamber 1, air air inlet 11, the first leakproof rod member 12, the first compression spring 13,
First pole 14；Second chamber 2, flue air inlet 21, the second leakproof rod member 22, the second compression spring
23, the second pole 24, inlet 25, overfall 26, leakage fluid dram 27, installing hole 28, installing plate 29；
Battery lead plate 31, insulation board 32, fixed underpan 33, lampblack absorber housing 4, capacitance type sensor 5, motor
6, blower fan 7, speed-regulating control circuit 8.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, described in be to the present invention
Explanation rather than restriction.
The present invention uses the full-automatic continuous adjustable range hood of capacitance type sensor, as it is shown in figure 1,
Including lampblack absorber housing 4, and be arranged in lampblack absorber housing 4 capacitance type sensor 5, by motor 6
The blower fan 7 driven and the speed-regulating control circuit 8 controlling motor 6；As in figure 2 it is shown, described condenser type
Sensor 5 includes that inside is provided with the first chamber 1 and noumenal seat of the second chamber 2, and joins with noumenal seat
The sensor housing closed；First chamber 1 is connected with the bottom of the second chamber 2, and inside is filled with liquid
Dielectric；In this preferred embodiment, liquid insulating medium uses transformer oil, and it is density 0.895 relatively,
And viscosity is less, it is possible to meet use demand.The height of the first chamber 1 is more than the height of the second chamber 2
Degree, the liquid level sectional area of liquid insulating medium is less than the liquid level sectional area of the second chamber 2；As it is shown on figure 3,
Air air inlet 11 that first chamber 1 is arranged by top and atmosphere, internal arranged along short transverse
There is the parallel relative battery lead plate 31 of two panels.
In this preferred embodiment, as in figure 2 it is shown, be sequentially connected with insulation board 32 bottom battery lead plate 31 and fix
Being connected to the fixed underpan 33 bottom the first chamber 1, insulation board 32 is by battery lead plate and other conductive devices
Separate, and can be fixed installation by fixed underpan 33, as in figure 2 it is shown, in this preferred embodiment
With screw, firm banking 33 is arranged on the bottom of the first chamber 1；Second chamber 2 is arranged by top
Flue air inlet 21 connects with common flue；Battery lead plate 31 as capacitance type sensor 5 outfan with
The input of speed-regulating control circuit 8 connects, and the outfan of speed-regulating control circuit 8 is connected with motor 6, wind
The outfan of machine 7 connects with common flue, and in this preferred embodiment, motor 6 uses monopole asynchronous motor.
In order to when preventing capacitance sensor from installing or toppling over, intracavity liquid is flowed out by air inlet, such as Fig. 2 institute
Showing, in this preferred embodiment, air air inlet 11 is arranged on the side of the first chamber 1, and is set by homonymy
Put the passage on the first chamber 1 sidewall and the first chamber 1 connects；It is inserted with in air air inlet 11
First leakproof rod member 12, the first leakproof rod member 12 lower end is sequentially connected with the first compression spring being coaxially disposed
13 and first pole 14.Flue air inlet 21 is arranged on the side of the second chamber 2；And set by homonymy
Put the passage on the second chamber 2 sidewall and the second chamber 2 connects；It is inserted with in flue air inlet 21
Second leakproof rod member 22, the second leakproof rod member 22 lower end is sequentially connected with the second compression spring being coaxially disposed
23 and second pole 24.When being inverted or toppling over, leakproof rod member is at the restoring force of compression spring with from heavy sensation of the body
Moving downward under the effect of power, leakproof rod member and air inlet offset and seal passage, thus prevent intracavity
The outflow of liquid insulating medium.
In this preferred embodiment, as in figure 2 it is shown, the second chamber 2 side is provided with inlet 25 and overfall
26, bottom is provided with leakage fluid dram 27；The position of inlet 25 is higher than the balance liquid level of liquid insulating medium,
Overfall 26 is arranged on the equilibrium position of liquid insulating medium.When injecting liquid from inlet, once
Overfall occurs that liquid overflows, and illustrates that liquid has reached desired volume, has the most reached equilbrium position, it is not necessary to
It is designed to transparent visual shell to the liquid level that detects by an unaided eye, and Liquid level is more accurate.Second
Chamber 2 bottom is inwardly indented formation breach, and the height of breach is less than liquid insulating medium at the second chamber 2
In minimum liquid level；Thus ensure that in the second chamber 2, effective liquid level sectional area of liquid insulating medium is steady
Determine not change；Installing plate 29 is set in breach, installing plate 29 is provided with for sensor housing even
The installing hole 28 connect, the total amount not being only injected into dielectric reduces, but also reduces volume and quality.
Under normal circumstances, when user normally uses range hood, the blast of common flue not over
400pa, the liquid level difference under this pressure reduction is about 50mm, the first chamber 1 and the second chamber of capacitance sensor
The liquid insulating medium of room 2 utilizes law of connected vessels to connect, this preferred embodiment uses the first chamber 1 with
The ratio of the sectional area of the second chamber 2 liquid level is 1:4, and therefore the ratio of liquid level change is 4:1, the first chamber liquid
The liquid level change that body produces is less than less than 40mm, the liquid level change that the second chamber liquid produces
10mm, therefore can reduce cavity volume downwards at 10mm below overfall, is reducing liquid
While charging amount, slot milling arranges installing plate 29, and by the installing hole made on installing plate 29
28 fixed installations being easy to capacitance sensor.The overall thickness of capacitance sensor the most of the present invention
Degree is 16mm, long 166mm, high 117mm, and volume is smaller, lightweight, is taken up space the least,
Installation site is flexible.
In this preferred embodiment, as shown in Figure 4, speed-regulating control circuit 8 includes for by capacitance sensor
Capacitance variations value is converted to the operation amplifier circuit of voltage signal, is connected to operation amplifier circuit in turn
The speed regulator of outfan and thyristor voltage regulation circuit, and the rotating speed being arranged on motor 6 outfan is anti-
Current feed circuit；The outfan of thyristor voltage regulation circuit is connected with the control end of motor 6；Speed feedback circuit
Feedback signal is input in speed regulator after subtracting computing with the output signal of operation amplifier circuit.?
In speed-adjusting and control system, according to capacitance sensor output signal self-regulation motor 6 rotating speed, thus control
The rotating speed of blower fan 7 and air quantity.The static structure of speed-regulating control circuit 8 as shown in Figure 4, has Uct=Kn(U0
—Un), U1=KsUct, Un=α n, wherein, KnStatic amplification for speed regulator；KsFor crystalline substance
The amplification of brake tube, α is speed feedback coefficient, and n is motor speed.UctDefeated for speed regulator
Go out voltage；U1For SCR-output voltage, it also it is motor input voltage；U0Output for operational amplifier
Voltage, is directly given by outfan；UnFeedback voltage for motor output end.
As it is shown in figure 5, described operation amplifier circuit includes operational amplifier and fixed capacity, fixing
The capacitance C of electric capacity is equal to the capacitance C of capacitance sensorXMaximum；One of operational amplifier
Input end grounding, connects with capacitance sensor after another input parallel connection fixed capacity.As it is shown in figure 5,
Electric capacity C during electric capacity is operational amplifier between two battery lead platesX, op-amp output voltage U0With the two poles of the earth
Between plate, electric capacity is directly proportional and linear, wherein, and the fixed capacity C power taking in operation amplifier circuit
Hold sensor capacitance CXMaximum, capacitance between the battery lead plate that the i.e. first chamber liquid level is corresponding time the highest.
Input/output relation according to operational amplification circuit has Uo=(CX/C)Ui, wherein, UiFor input voltage,
Negative sign represents that output is anti-phase with input voltage signal.
The present invention takes the pressure of atmospheric pressure and common flue respectively and acts on two chambers of capacitance type sensor
Liquid level, and make liquid level be in balance position by the type selecting arranging speed-regulating control circuit 8 parameter and blower fan
When putting, blower fan air draft pressure is 30～60Pa, i.e. ensures that blower fan exhaust outlet exceeds than common flue pressure
30～60Pa, to realize smoke evacuation smoothly；And when the first chamber 1 liquid level is in extreme higher position motor two ends
Voltage reach rated voltage 220V of motor, blower fan air draft pressure also reaches about 450Pa, i.e. ensures
Blower fan exhaust outlet and the pressure reduction of common flue, it is to avoid the situation of oil smoke suck-back occur, ensure that lampblack absorber
The purpose of power and energy saving has been reached while normal smooth and easy smoke evacuation.
Claims (4)
1. use the full-automatic continuous adjustable range hood of capacitance type sensor, it is characterised in that include
Lampblack absorber housing (4), and be arranged in lampblack absorber housing (4) capacitance type sensor (5), by electricity
Blower fan (7) that machine (6) drives and control the speed-regulating control circuit (8) of motor (6)；Described electric capacity
Formula sensor (5) includes that inside is provided with the first chamber (1) and the noumenal seat of the second chamber (2), and
The sensor housing coordinated with noumenal seat；First chamber (1) is connected with the bottom of the second chamber (2),
Inside is filled with liquid insulating medium；The height of the first chamber (1) is more than the height of the second chamber (2),
The liquid level sectional area of liquid insulating medium is less than the liquid level sectional area of the second chamber (2)；The second described chamber
Room (2) bottom is inwardly indented formation breach, and the height of breach is less than liquid insulating medium in the second chamber (2)
In minimum liquid level；Installing plate (29) is set in breach, installing plate (29) is provided with for and senses
The installing hole (28) that device housing connects；The air air inlet (11) that first chamber (1) is arranged by top
With atmosphere, inside is provided with the parallel relative battery lead plate (31) of two panels along short transverse；Second chamber
(2) the flue air inlet (21) arranged by top is connected with common flue；Battery lead plate (31) conduct
The outfan of capacitance type sensor (5) is connected with the input of speed-regulating control circuit (8), speed regulating control
The outfan of circuit (8) is connected with motor (6), and the outfan of blower fan (7) connects with common flue；
Described air air inlet (11) is arranged on the side of the first chamber (1), and is arranged by homonymy
Passage on the first chamber (1) sidewall and the first chamber (1) connection；Air air inlet (11)
Inside being inserted with the first leakproof rod member (12), the first leakproof rod member (12) lower end is sequentially connected with and is coaxially disposed
First compression spring (13) and the first pole (14)；
Described battery lead plate (31) bottom is sequentially connected with insulation board (32) and is fixedly connected on the first chamber
(1) fixed underpan (33) of bottom；
Described flue air inlet (21) is arranged on the side of the second chamber (2)；And arranged by homonymy
Passage on the second chamber (2) sidewall and the second chamber (2) connection；Flue air inlet (21)
Inside being inserted with the second leakproof rod member (22), the second leakproof rod member (22) lower end is sequentially connected with and is coaxially disposed
Second compression spring (23) and the second pole (24)；
Described the second chamber (2) side is provided with inlet (25) and overfall (26), and bottom sets
It is equipped with leakage fluid dram (27)；The position of inlet (25) is higher than the balance liquid level of liquid insulating medium, overflow
Mouth (26) is arranged on the equilibrium position of liquid insulating medium.
The full-automatic continuous adjustable fume-exhausting of employing capacitance type sensor the most according to claim 1
Machine, it is characterised in that described speed-regulating control circuit (8) includes for being become by the electric capacity of capacitance sensor
Change value is converted to the operation amplifier circuit of voltage signal, is connected to operation amplifier circuit outfan in turn
Speed regulator and thyristor voltage regulation circuit, and be arranged on motor (6) outfan speed feedback electricity
Road；The outfan of thyristor voltage regulation circuit is connected with the control end of motor (6)；Speed feedback circuit anti-
Feedback signal is input in speed regulator after subtracting computing with the output signal of operation amplifier circuit.
The full-automatic continuous adjustable fume-exhausting of employing capacitance type sensor the most according to claim 2
Machine, it is characterised in that described operation amplifier circuit includes operational amplifier and fixed capacity, fixing
The capacitance C of electric capacity is equal to the capacitance C of capacitance sensorXMaximum；One of operational amplifier
Input end grounding, connects with capacitance sensor after another input parallel connection fixed capacity.
The full-automatic continuous adjustable fume-exhausting of employing capacitance type sensor the most according to claim 1
Machine, it is characterised in that described liquid insulating medium uses transformer oil, described motor (6) to use
Monopole asynchronous motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410039989.7A CN103776076B (en) | 2014-01-27 | 2014-01-27 | Use the full-automatic continuous adjustable range hood of capacitance type sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410039989.7A CN103776076B (en) | 2014-01-27 | 2014-01-27 | Use the full-automatic continuous adjustable range hood of capacitance type sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103776076A CN103776076A (en) | 2014-05-07 |
| CN103776076B true CN103776076B (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410039989.7A Expired - Fee Related CN103776076B (en) | 2014-01-27 | 2014-01-27 | Use the full-automatic continuous adjustable range hood of capacitance type sensor |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287889B (en) * | 2016-09-30 | 2018-11-06 | 宁波方太厨具有限公司 | The rotation speed of fan Automatic adjustment method of range hood and the regulating device for realizing this method |
| CN107062332B (en) * | 2017-04-12 | 2018-12-25 | 顾林鹏 | A kind of kitchen ventilator autocontrol method based on capacitance type sensor |
| CN107202352B (en) * | 2017-08-02 | 2019-02-22 | 佛山市顺德区科唛卫厨制造有限公司 | A kind of kitchen, which is smoked, uses purification device |
| CN111174261B (en) * | 2020-02-27 | 2022-03-18 | 宁波方太厨具有限公司 | Range hood and control method thereof |
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|---|---|---|---|---|
| CN2443351Y (en) * | 2000-10-28 | 2001-08-15 | 杨继章 | Multi-interface liquid level testing system |
| CN101458099A (en) * | 2008-12-20 | 2009-06-17 | 张学亮 | Capacitance type sensor |
| CN101839945A (en) * | 2010-05-13 | 2010-09-22 | 常州大学 | Non-contact conductivity sensor |
| JP2011203099A (en) * | 2010-03-25 | 2011-10-13 | Tokyo Electric Power Co Inc:The | Apparatus for inspecting operation of pressure equipment containing liquid, and method of inspecting operation of pressure equipment containing liquid using the apparatus |
| CN102589795A (en) * | 2012-02-17 | 2012-07-18 | 宁波方太厨具有限公司 | Wind pressure sensor |
| CN202470170U (en) * | 2012-02-17 | 2012-10-03 | 宁波方太厨具有限公司 | Smoke exhauster with adaptively adjusted fan speed |
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2014
- 2014-01-27 CN CN201410039989.7A patent/CN103776076B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2443351Y (en) * | 2000-10-28 | 2001-08-15 | 杨继章 | Multi-interface liquid level testing system |
| CN101458099A (en) * | 2008-12-20 | 2009-06-17 | 张学亮 | Capacitance type sensor |
| JP2011203099A (en) * | 2010-03-25 | 2011-10-13 | Tokyo Electric Power Co Inc:The | Apparatus for inspecting operation of pressure equipment containing liquid, and method of inspecting operation of pressure equipment containing liquid using the apparatus |
| CN101839945A (en) * | 2010-05-13 | 2010-09-22 | 常州大学 | Non-contact conductivity sensor |
| CN102589795A (en) * | 2012-02-17 | 2012-07-18 | 宁波方太厨具有限公司 | Wind pressure sensor |
| CN202470170U (en) * | 2012-02-17 | 2012-10-03 | 宁波方太厨具有限公司 | Smoke exhauster with adaptively adjusted fan speed |
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| CN103776076A (en) | 2014-05-07 |
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Granted publication date: 20170104 Termination date: 20210127 |