CN100470409C - Modified electric pressure cooker - Google Patents
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- CN100470409C CN100470409C CNB200710153851XA CN200710153851A CN100470409C CN 100470409 C CN100470409 C CN 100470409C CN B200710153851X A CNB200710153851X A CN B200710153851XA CN 200710153851 A CN200710153851 A CN 200710153851A CN 100470409 C CN100470409 C CN 100470409C
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Abstract
The invention provides an improved pressure cooker, comprising an outer cooker, an inner cooker, a heating device, a sealing device, a safety device and a control circuit which controls the pressure cooker to work, the cooker bottom of the outer cooker is an elastic plate. Besides, the invention also comprises a capacitance sensor, wherein the capacitance sensor comprises a first polar plate and a second polar plate, the cooker bottom of the outer cooker is elastically deformed by the pressure to generate displacement, thus driving the first polar plate to move corresponding to the second polar plate and changing the distance between the two polar plates, then the signal of the capacitance change value is generated and inputted to the control circuit to detect and dispose, thus controlling the electric pressure cooker to work. The invention achieves the real-time detection and control of the pressure. As the pressure is continuous and adjustable, different pressure or working time can be chose according to the condition of different food during the process of cooking. The capacitance value extra generated due to the capacitance sensor being disturbed by the temperature and the electromagnetic is counteracted by the compensating capacitance greatly. The signal quantity is effectively enlarged by the lever device, thus improving the detecting accuracy and the sensibility of the capacitance sensor.
Description
Technical field
The present invention relates to a kind of pressure cooker, particularly a kind of improved electric pressure cooking saucepan.
Background technology
At present, electric pressure cooking saucepan substitutes existing old-fashioned pressure cooker because it is energy-conservation, advantage fast, easily, becomes one of family kitchen daily electrical home appliance product.The electric pressure cooking saucepan of selling on the existing market is mainly containing three types aspect pressure control and the pressure adjusting.
First type is in the bottom of electric pressure cooking saucepan outer pot one flash switch to be set, and the heating plate setting can touch the feeler lever of flash switch break-make.Move up and down with the variation of internal pressure during pot work in utilizing and trigger or disconnect heating arrangement.When electric pressure cooking saucepan was worked, pot inner pressure raise, and heating plate is to bottom offset, and after pot inner pressure was raised to certain value, heating plate moved down and drives feeler lever shake-up flash switch, makes flash switch disconnect heater stop work; After pressure descended, heating plate drove feeler lever and leaves flash switch to top offset, flash switch closure, the work of conducting heating arrangement.Reach the purpose of controlled pressure pot internal pressure with this.
The patent No. of announcing as State Patent Office is: 91100026.7, and Granted publication day is in the patent of invention on June 23rd, 1993, discloses the hermetically sealed automatic electric heating pressure cooking appliance of a kind of family expenses.By rigid arm on the right cylinder and elastic arm, the pot cover and the pot body that will have O-ring seal compress the realization sealing, have provided the Rational structure of the fully-sealed electric cooker elasticity closing and opening cover during booting of safe ready.Drive adjustable flash switch with elastic arm, control the heated condition of the electric hot plate between the bottom of a pan and the elastic arm, realize the adjustment of electric cooker internal pressure and control automatically, formed the ideal model of fully-sealed electric cooker.
And for example the patent No. of State Patent Office's announcement is: 200420094674.4, Granted publication day is in the utility model patent on January 18th, 2006, a kind of electric pressure cooking saucepan of automatic Regulation is disclosed, comprise pot cover, shell, outer pot, base, heat-generating disc, place the interior pot on the heat-generating disc, elastic body and pressure switch, being provided with elastic body between described heat-generating disc and the outer pot bottom is connected, also be provided with the elastic body distortion on the heat-generating disc and can touch the catch bar of pressure switch, described elastic body is provided with the bearing surface that is connected with heat-generating disc, and be supported on flexible feet on the outer pot bottom, be provided with at least one pair of described elastic body between described heat-generating disc and the outer pot bottom.Pressure when utilizing electric pressure cooking saucepan work changes, and heating plate moves up and down, and drives catch bar and triggers pressure switch, the work of controlled pressure pot.
The problem that the electric pressure cooking saucepan of the type exists is that pressure is unadjustable, is a fixed pressure value.When cooking different food, can only realize by the length of setting-up time.And different food often needs different force value to realize best cooking effect.As beef, the best of chop or congee culinary art force value is just different.As only coming cooking food by regulating time length, the food of cooking out is relatively poor aspect the nutritional labeling of mouthfeel and reservation.
Second type is the pot cover inside at electric pressure cooking saucepan, corresponding to the top of interior pot temperature sensor or pressure transducer is set, and comes temperature variation or pressure in the perception pot to change, and signal is inputed to circuit detects control.Quit work when pot inner pressure reaches set pressure, pressure restarts work when falling after rise.
In this scheme, pressure transducer or temperature sensor must directly contact with the cavity of interior pot, with pressure or the temperature in the pot in the perception.So just make the installation site very limited, owing to interior pot of often taking-up cleaning, the connection of electric wire, the transmission of signal also has problems, so can't directly be arranged in interior pot.Generally all be installed on the pot cover.When interior pan boiling congee or when cooking other foods, a large amount of foams or tiny hard thing can flood or damage sensor, influence the induction sensitivity of sensor, make the sensor can't operate as normal.
For the scheme of serviceability temperature sensor, need to gather earlier kettle temperature, with corresponding temperature transition the force value corresponding with this temperature value, this conversion has a conversion table in the general sense that draws through experiment, sees the following form:
By a large amount of experiments, temperature and pressure have certain corresponding relation, and the temperature of working as water from subordinate list as can be seen surpasses 100 ℃, every increase by 1 degree of temperature, and pressure increases 5kPa.
| Temperature ℃ | 80 | 90 | 100 | 101 | 102 | 103 | 104 | 105 | 106 |
| Pressure kPa | 0 | 0 | 0 | 5 | 10 | 15 | 20 | 25 | 30 |
| Temperature ℃ | 107 | 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 |
| Pressure kPa | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 |
Annotate: environment temperature is 25 ℃, 1 standard atmospheric pressure,
The conversion of pointed temperature and pressure is to be 25 degree in environment temperature in the table, and environmental pressure is that 1 normal atmosphere is depressed by a large amount of experiments and drawn.When environment temperature changes, or environment atmospheric pressure is because during different rather than standard atmospheric pressure of physical features, this corresponding conversion table is inaccurate.In addition, for temperature sensor, because the weight of food, density, the composition difference that contained, also be not quite similar for the requirement of temperature.Also can have influence on the conversion of temperature and pressure.So the force value of temperature correspondence is incomplete same under different environment temperatures, environment atmospheric pressure and food.The result who directly causes detects exactly and error occurs, and precision and sensitivity descend significantly.And then influence effective control of pressure.In case the detection and the control of pressure lose accuracy, will increase the danger coefficient that electric pressure cooking saucepan uses, be unsafe for the user.
In addition, adopt the manufacturing cost of pressure or temperature sensor higher, be unfavorable for the popularization of electric pressure cooking saucepan.
The third type is in electric pressure cooking saucepan inside telefault to be set, and pot is stressed and changes the inductance value that the displacement that produces changes telefault in utilizing, and extracts the inductance value that changes, and carries out judgment processing, comes the pressure of controlled pressure pot with this.
This scheme is that a telefault is set below outer pot mostly, at interior pot bottom or heating plate bottom one feeler lever is set.When the electric pressure cooking saucepan inner pot pressure changed, interior pot or heating plate moved up and down, and the drive feeler lever stretches into or stretches out telefault, changes inductance value with this, carries out judgment processing according to the inductance value that changes, the work of control electric pressure cooking saucepan.
Because telefault self characteristics instability, be vulnerable to the interference of external environment conditions such as temperature, electromagnetism, there is error easily for the detection of pot inner pressure, further influence pressure controlled stability.And in a single day deviation appears in the detection of electric pressure cooking saucepan pressure, unstable, be subject to the interference of environmental factor, it is very big to be easy to occur the pressure cooker awp, and detected pressure is owing to reasons such as poor stability situation less than normal, can cause the danger of sudden and violent pot, concerning the user, be breakneck.So for such scheme, the interference performance that improves stability and external environmental factors such as resisting temperature, electromagnetism is crucial, this is directly connected to the safe in utilization and user's of electric pressure cooking saucepan safety.
In addition, adopt the cost of telefault also higher.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the invention provides a kind of improved pressure cooker.Realized the real-time detection and the control of pressure, pressure is adjustable continuously, can select different pressure or working time according to the situation of different foods in the process of culinary art.
The main technical schemes that the present invention adopts is: a kind of improved electric pressure cooking saucepan, comprise outer pot, be positioned over interior pot in the described outer pot, in the sealing pot packoff, with described in pot match be used to heat described in pot electric heater unit, safety feature, and the control circuit of controlling described electric heater unit work, the bottom of a pan of described outer pot is an elastic plate, described control circuit comprises capacitive transducer, signal processing circuit and signal controlling output circuit; Described capacitive transducer comprises first pole plate, second pole plate, is respectively equipped with the signals collecting end on described first pole plate and second pole plate; Described signals collecting end is connected with the signal receiving end of described signal processing circuit; Described capacitive transducer matches with described electric pressure cooking saucepan, the change in displacement that induced electricity pressure pot is stressed and change produces, and the variable signal that this change in displacement is converted to electric capacity inputed to described signal processing circuit; The signal output part of described signal processing circuit is connected with the signal receiving end of described signal controlling output circuit, and described signal processing circuit is handled the electric capacity signal that receives, and the signal after will handling exports described signal controlling output circuit to; Described signal controlling output circuit comes control circuit according to the described processing signals that receives, and controls the work of described electric heater unit with this.
The present invention also comprises following attached technical scheme: described control circuit also comprises with the capacitive transducer capacitance and is subjected to temperature and electromagnetic interference (EMI) to change the building-out capacitor of capacitance simultaneously;
Described building-out capacitor comprises two pole plates, and one of them pole plate is first pole plate or second pole plate of described capacitive transducer;
Described first pole plate is corresponding with second pole plate, pot is stressed to change and produces change in displacement in described, and described first pole plate of direct or indirect thus drive moves in opposite directions or dorsad with respect to described second pole plate, distance between minimizing or the increase and second pole plate is with this electric capacity signal that changes;
Between the bottom of a pan of described outer pot and described first pole plate shift transmission part is set, pot is stressed to change and produces change in displacement in described, move in the bottom of a pan that drives described electric heater unit, outer pot, drive first pole plate by described shift transmission part and move, described second pole plate is installed on the sidewall of described outer pot by a support;
Described shift transmission part is a screw rod, and the bottom of a pan of described outer pot and/or first pole plate are provided with and the corresponding threaded hole of described screw rod, and described first pole plate is threaded with the bottom of a pan of described outer pot by described screw rod;
Described shift transmission part is a push rod, is provided with between described first pole plate and second pole plate and can drives the elastic body that first pole plate moves, and an end of described push rod is connected in the bottom of a pan or first pole plate of described outer pot, and the other end is affixed on the bottom of a pan of first pole plate or outer pot;
Between described shift transmission part and described first pole plate leverage is set, described shift transmission part drives the galianconism end of described leverage, and long arm end drives described first pole plate;
Described first pole plate and second pole plate are set below described outer pot, described first pole plate and second pole plate are in the same plane, corresponding with the bottom of a pan of outer pot respectively, the bottom of a pan of described outer pot is produced mobile by the variation of interior pot displacement, and changes the electric field medium of first pole plate and the generation of second pole plate thus;
Described first pole plate is corresponding with second pole plate, pot is stressed to change and produces change in displacement in described, and the motion of described first pole plate of direct or indirect thus drive and/or second pole plate, change the effective corresponding area between first pole plate and second pole plate, with this electric capacity signal that changes;
Between the bottom of a pan of described outer pot and described first pole plate displacement guide rod is set, the two ends of described displacement guide rod are connected with the bottom of a pan and/or first pole plate of described outer pot respectively, pot is stressed to change and produces change in displacement in described, move in the bottom of a pan that drives described outer pot, the bottom of a pan of described outer pot drives first pole plate by described displacement guide rod and moves, and described second pole plate is installed on the sidewall of described outer pot by a support;
Between described displacement guide rod and described first pole plate leverage is set, described displacement guide rod drives the galianconism end of described leverage, and long arm end drives described first pole plate.
The beneficial effect that adopts the present invention to bring:
(1) the present invention adopts capacitive transducer, and the variation that utilizes the outer pot the bottom of a pan to be stressed produces displacement, gathers the capacitance that changes, and capacitance is carried out judgment processing, the work of control electric pressure cooking saucepan.The capacitive transducer that the present invention adopts realized capacitance with the variation of pressure real-time change, and set relatively capacitance of benchmark according to the capacitance of real-time change, judge with this whether pressure surpasses the force value that the user sets.The user can be according to the food situation of reality culinary art when the setting benchmark compares capacitance, the scope and the working time of real-time adjustment force value, utilize existing mature C PU control technology, can detect and realize control to multiparameter information such as pressure, temperature, times, even make the control gear of similar electromagnetic oven " PTT " formula, with different food correspondences, realized the adjustable continuously of force value.Set different pressure for different food, better guaranteed the taste and the nutritional labeling of food.
(2) capacitive transducer good stability, the capacitance signal is reliable, the induction precision height.Bring the control of electric pressure cooking saucepan more accurate thus, precision is higher.
(3) pole plate of capacitive transducer of the present invention is connected with outer pot, and the displacement that the variation that utilizes the bottom of a pan of outer pot to be stressed produces forms the capacitance variations value.With displacement conversion is that capacitance detects the pressure in the pot, need not to resemble pressure transducer or temperature sensor and is arranged in the interior pot.Detect reliably, be beneficial to the extraction signal.And the interference of cooking food in the pot in can not being subjected to.
(4) the present invention is provided with building-out capacitor on the basis of capacitive transducer, building-out capacitor can respond in real time because the capacitance variations that factors such as temperature, electromagnetic interference (EMI) produce, calculate by processing of circuit, can compensate the measured value of revising capacitive transducer, make by handling the variation that the measured value that calculates reflects displacement more accurately, be subjected to Effect of Environmental still less, improved pressure controlled accuracy and stability.
(5) the present invention is provided with leverage between the pole plate outer pot the bottom of a pan of capacitive transducer, utilizes the amplification principle of lever to drive distance between the capacitive transducer pole plate; Perhaps the pole plate with capacitive transducer is provided with the area that multilayer increases pole plate, amplifies capacitance at double, improves the sensitivity that detects.
(6) capacitive transducer is with low cost, simple in structure, is easy to produce in batches.
(7) pole plate of capacitive transducer of the present invention and heating plate adopt screw rod to be connected, can by adjusting screw(rod) control between pole plate distance realization capacitive transducer polar plate spacing from fine setting.Improve the sensitivity and the precision of capacitive transducer.
Description of drawings
Fig. 1 is the whole cut-away view of first embodiment of the invention; Illustrate the outer pot the bottom of a pan drive the capacitive transducer pole plate change polar plate spacing from, capacitive transducer and building-out capacitor are the technical scheme of complex form;
Fig. 2, Fig. 3 are respectively two whole cut-away views of second embodiment of the invention, and two kinds of implementation structures are shown respectively; Illustrate the outer pot the bottom of a pan drive the capacitive transducer pole plate change polar plate spacing from, capacitive transducer and building-out capacitor are located on the support, capacitive transducer and building-out capacitor are the technical scheme of complex form;
Fig. 4 is the whole cut-away view of third embodiment of the invention; Illustrate the outer pot the bottom of a pan drive the capacitive transducer pole plate change polar plate spacing from, capacitive transducer and building-out capacitor be the technical scheme of setting separately;
Fig. 5 is the whole cut-away view of fourth embodiment of the invention; Illustrate the outer pot the bottom of a pan by leverage drive the capacitive transducer pole plate change polar plate spacing from, capacitive transducer and building-out capacitor are the technical scheme of complex form;
Fig. 6, Fig. 7 are respectively two whole cut-away views of fifth embodiment of the invention, and two kinds of implementation structures are shown respectively; The outer pot the bottom of a pan is shown drives area between capacitive transducer pole plate change pole plate, capacitive transducer and building-out capacitor are the technical scheme of complex form;
Fig. 8 is the whole cut-away view of sixth embodiment of the invention; The outer pot the bottom of a pan is shown drives area between capacitive transducer pole plate change pole plate by leverage, capacitive transducer and building-out capacitor are the technical scheme of complex form;
Fig. 9 is the whole cut-away view of seventh embodiment of the invention; The outer pot the bottom of a pan changes the electric field medium that forms between two pole plates of capacitive transducer by the displacement of elastic deformation generation up and down technical scheme is shown;
Figure 10 adopts the structure cut-away view of many groups form for capacitive transducer of the present invention;
Figure 11 is the upward view of pot cover of the present invention;
Figure 12 is the A-A cut-away view of Figure 11, and the structure of pressure limiting valve is shown;
Figure 13 is the circuit block diagram of control circuit of the present invention;
Figure 14 is the physical circuit figure of Figure 13;
Embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed description:
The label of component names correspondence is as follows among the figure:
Extremely shown in Figure 14 as Fig. 1, be a kind of improved electric pressure cooking saucepan provided by the invention, comprise outer pot 1, be positioned over interior pot 2 in the outer pot 1, in the sealing pot 2 packoff 3, match with interior pot 2 be used to heat in electric heater unit 4, the safety feature 6 of pot 2, and control electric heater unit 4 control circuit of working.Control circuit comprises capacitive transducer 8, signal processing circuit 71 and signal controlling output circuit 72.
Capacitive transducer 8 comprises first pole plate 81, second pole plate 82.Be respectively equipped with the signals collecting end on first pole plate 81 and second pole plate 82.The signals collecting end is connected with the signal receiving end of signal processing circuit 71.Capacitive transducer 8 matches with electric pressure cooking saucepan, the change in displacement that induced electricity pressure pot is stressed and change produces, and the variable signal that this change in displacement is converted to electric capacity inputed to signal processing circuit 71.The signal output part of signal processing circuit 71 is connected with the signal receiving end of signal controlling output circuit 72, and signal processing circuit 71 is handled the electric capacity signal that receives, and the signal after will handling exports signal controlling output circuit 72 to.Signal controlling output circuit 72 comes control circuit according to the processing signals that receives, and controls the work of electric heater unit 4 with this.
In the present invention, control circuit also comprises the building-out capacitor 9 that the capacitance of capacitance and capacitive transducer 8 takes place simultaneously, changes simultaneously when being subjected to temperature and electromagnetic interference (EMI).Building-out capacitor 9 comprises two pole plates, and one of them pole plate is first pole plate 81 or second pole plate 82 of capacitive transducer.The present invention is provided with building-out capacitor 9 on the basis of capacitive transducer, building-out capacitor 9 can respond in real time because the capacitance variations that factors such as temperature, electromagnetic interference (EMI) produce, calculate by processing of circuit, can compensate the measured value of revising capacitive transducer, make by handling the variation that the measured value that calculates reflects displacement more accurately, be subjected to Effect of Environmental still less, improved pressure controlled accuracy and stability.
Between the outer pot 1 and first pole plate 81 shift transmission part 10 is set, interior pot 2 is stressed to change and produces change in displacement, drives electric heater unit 4 and moves, and electric heater unit 4 makes the bottom of a pan generation elastic deformation of outer pot 1, produce displacement, drive first pole plate 81 by shift transmission part 10 and move.
In each embodiment provided by the invention, electric heater unit 4 is the cast aluminium heating plate, also can be electromagnetic coil assembly, and packoff 3 is " people " font O-ring seal, safety feature 6 comprise as shown in Fig. 5, Fig. 6 pressure limiting valve or etc. the structure of same-action.The effect that safety feature 6 of the present invention plays is when electric pressure cooking saucepan work, when pot inner pressure reaches the dangerous pressure value, lays down pot inner pressure and prevents that quick-fried pot is dangerous by outage, mode such as lose heart.The outer ring of pot cover 15 fastens by pot tooth buckle structure and outer pot 1, and inner ring is by chevron shaped O-ring seal and 2 pressings mutually of interior pot, pot 2 in the sealing.
Cooperating except above-mentioned said " revolving type " between the pot cover 15 that patent of the present invention relates to and interior pot 2 and the outer pot 1, also " flip-shell " structure.
In first embodiment provided by the invention, as shown in Figure 1, interior pot 2 fits tightly with heating plate 4, fits in the bottom of the bottom of a pan of outer pot 1 and heating plate 4.The bottom of outer pot 1 is that resilient material is made and can be produced certain elastic deformation, produces displacement.Between outer pot 1 and shell 17, the bottom of shell 17 is provided with capacitive transducer 8 and building-out capacitor 9, in this programme, capacitive transducer 8 is a complex form with building-out capacitor 9, and second pole plate 82 of capacitive transducer 8 is all a pole plate with second pole plate 92 of building-out capacitor 9.First pole plate 81 of capacitive transducer 8 is connected with the bottom of a pan of outer pot 1 by shift transmission part 10.
In the present embodiment, shift transmission part 10 is a connecting link.Interior pot 2 is stressed and moves up and down, the bottom of a pan elastic deformation that is driven outer pot 1 by the heating plate 4 that fits tightly with it produces to bottom offset, the bottom of a pan of outer pot 1 passes to first pole plate 81 with displacement up and down by shift transmission part 10, driving first pole plate 81 moves relative to second pole plate 82, thereby produce the capacitance variations value, input to control circuit board 7.
In second embodiment provided by the invention, shift transmission part 10 is a screw rod, and the bottom of a pan of outer pot 1 and/or first pole plate 81 are provided with and the corresponding threaded hole of screw rod, and first pole plate 81 is threaded mutually by the bottom of a pan of screw rod with outer pot 1.
As shown in Figure 2, for realizing a structural drawing of second embodiment of the invention.Capacitive transducer 8 is a complex form with building-out capacitor 9, makes a single piece, is installed in the housing.Housing is provided with threaded rod, is threaded with support 12 on the sidewall that is arranged at outer pot 1.So-called complex form is meant that second pole plate 82 of capacitive transducer 8 and second pole plate 92 of building-out capacitor 9 are all a pole plate, and second pole plate 92 and first pole plate 91 of building-out capacitor are fixed, and the variation on the spacing does not take place each other.First pole plate 81 is fixedlyed connected with an end of shift transmission part 10 (being screw rod), and the bottom of a pan of outer pot 1 is threaded mutually.The bottom of a pan of outer pot 1 is subjected to moving up and down of interior pot 2 to produce elastic deformation and moves with respect to second pole plate 82 by shift transmission part 10 drives first pole plate 81, produces the capacitance variations value with this, inputs to control circuit.Compensating circuit 9 is used for the deviation that the building-out capacitor sensor is subjected to the capacitance signal of temperature, electromagnetic interference (EMI) generation.
In the present embodiment, first pole plate 81 is connected with shift transmission part 10, one end of shift transmission part 10 is owing to be to be threaded with the bottom of a pan of interior pot 1, in actual use, can transmit the degree of depth that part 10 (being screw rod) control stretches into threaded hole by swing offset and come adjustment first pole plate 81 of trace and the initial distance of 82 on second pole plate, improve the precision of detection.Dirigibility, compliance is better.
As shown in Figure 3, for realizing another structural drawing of second embodiment of the invention.Capacitive transducer mutually compound among Fig. 28 and building-out capacitor 9 are put upside down 180 degree.This moment, shift transmission part 10 can be considered as installing the mutually compound capacitive transducer and the housing of building-out capacitor.Be connected on the support 12 and then realize by the screw rod of being located on the pole plate among Fig. 2.At this moment, be positioned at two of the housing internal upper part and be respectively first pole plate 91 of building-out capacitor 9 and first pole plate 81 of capacitive transducer 8, and first pole plate 81 is same pole plate with second pole plate 92 of building-out capacitor 9 also with the fixing pole plates of housing.The mobilizable pole plate that is positioned at lower housing portion is second pole plate 82 of capacitive transducer 8.
When the housing that drives mutually compound capacitive transducer 8 and building-out capacitor 9 in the bottom of a pan of outer pot 1 moves up and down, first pole plate 91 and second pole plate 92 of building-out capacitor 9 move up and down simultaneously, then be not move each other, and with first pole plate 81 of the capacitive transducer 8 of second pole plate, the 92 shared pole plates of building-out capacitor 9 relative to moving really with second pole plate 82, change the spacing between them, produced the capacitance variations value.In this scheme, advantage is that mainly the position of screw thread fine setting changed on the outer pan bracket, but the operating space increase, more convenient for personnel's adjusting.
In the present invention, capacitive transducer 8 and building-out capacitor 9 can be fixed on the sidewall of outer pot 1 by L bracket 12, also can be fixed in the bottom of outer pot 1 by the U-shaped support.
In the 3rd embodiment provided by the invention, as shown in Figure 4, building-out capacitor 9 is to be provided with separately.Be installed on the support 12 of outer pot 1.Elastic body 11 is a S shape shell fragment, and elastic body 11 is between first pole plate 81 and second pole plate 82.One end of push rod 10 is connected with first pole plate 81 in the capacitive transducer 8, fits in the bottom of the other end and outer pot 1.When work, outer pot 1 moves down, driving the push rod 10 of fitting with its bottom of a pan moves down, push rod 10 and then drive first pole plate 81 and move down, first pole plate, the 81 extruding S shape shell fragments 11 that move down are when the bottom of a pan of outer pot 1 moves up, extruded S shape shell fragment 11 elastic resets, and upwards lean the applying that first pole plate, 81, the first pole plates 81 drive the bottom of push rod 10 continuation maintenances and outer pot 1, move up and down thereby finish.And produce the capacitance variations value signal, input to control circuit board 7, the deviation of the capacitance that occurs when the building-out capacitor 9 building-out capacitor sensors 8 that are provided with are subjected to temperature, electromagnetic interference (EMI) separately.
In this scheme, building-out capacitor 9 is to be arranged on separately in the electric pressure cooking saucepan.Certainly, in other schemes that the present invention provides, building-out capacitor 9 also can be provided with separately, and is independent mutually with capacitive transducer 8.
In the provided by the invention the 4th implements, as shown in Figure 5, capacitive transducer 8 is a complex form with building-out capacitor 9, and be installed on the support 12 of outer pot 1 sidewall, between the shift transmission part 10 and first pole plate 81 leverage 13 is set, one end of shift transmission part 10 is connected with the bottom of heating plate 4, and the galianconism end of the other end and leverage 13 is hinged, and the long arm end of leverage 13 and first pole plate 81 are hinged.When the bottom of a pan of outer pot 1 produces deformation, when moving up and down, the shortwall end that shift transmission part 10 drives leverages 13 rotates, and the shortwall end rotates by the lever drives long arm end, long arm end and then drive first pole plate 81 and move up and down.Utilize the amplification principle of lever to drive distance between the capacitive transducer pole plate; Amplify capacitance at double, improve the sensitivity that detects.
This scheme has utilized lever principle to come displacement enlargement amount at double.Certainly, structure as shown in Figure 10, pole plate that also can capacitive transducer is set to multilayer, organizes structure more, to increase the area between pole plate, can realize amplifying at double capacitance equally, the sensitivity of raising detection.
In the 5th embodiment provided by the invention, first pole plate 81 is corresponding with second pole plate 82, the bottom of a pan of outer pot 1 is stressed to change and produces the elastic deformation of upper and lower displacement, and direct or indirect thus drive first pole plate 81 and/or 82 motions of second pole plate, change the effective corresponding area between first pole plate 81 and second pole plate 82, with this electric capacity signal that changes.
As shown in Figure 6, for realizing a structural drawing of fifth embodiment of the invention.Capacitive transducer 8 is a complex form with building-out capacitor 9, and is installed on the support 12 of outer pot 1 sidewall.Vertical mutually between each pole plate of capacitive transducer 8 and building-out capacitor 9 and the bottom of outer pot 1.Between the bottom of outer pot 1 and first pole plate 81 a displacement guide rod 14 is set, the two ends of displacement guide rod 14 are connected with first pole plate 81 with the bottom of a pan of outer pot 1 respectively, the bottom of a pan of outer pot 1 is stressed to change and produces elastic deformation, produce change in displacement, and drive first pole plate 81 by displacement guide rod 14 and move up and down, change first pole plate 81 and connect, produce the capacitance variations value signal with this, and input to control circuit board 7 with respect to the limited corresponding surface of second pole plate 82.
As shown in Figure 7, realize the structural drawing of fifth embodiment of the invention for another.In structural drawing, one end of displacement guide rod 14 is threaded with the bottom of a pan of outer pot 1, the other end fits on the sidewall of first pole plate 81 of capacitive transducer 8, against a compression spring 18, the other end of compression spring 18 is fixed in the housing of mutually compound capacitive transducer 8 and building-out capacitor 9 on another sidewall of first pole plate 81.When the bottom of a pan of outer pot 1 elastic deformation moves down, drive displacement guide rod 14 and press down first pole plate 81 that fits with it, driving first pole plate 81 moves down, compression compression spring 18, when the bottom of a pan of outer pot 1 resets when moving up, compression spring 18 resets, and upwards leans first pole plate 81, make first pole plate 81 continue to fit, move up and down thereby finish with displacement guide rod 14.Produce the capacitance variations value signal with this, and input in the control circuit board 7.
In the 6th embodiment that the present invention provides, as shown in Figure 8, between the displacement guide rod 14 and first pole plate 81 leverage 13 is set, one end of displacement guide rod 14 is connected with the bottom of outer pot 1, the galianconism end of the other end and leverage 13 is hinged, and the long arm end of leverage 13 and first pole plate 81 are hinged.When heating plate 4 moved up and down, the shortwall end that displacement guide rod 14 drives leverages 13 rotated, and the shortwall end rotates by the lever drives long arm end, long arm end and then drive first pole plate 81 and move up and down.Utilize the amplification principle of lever to drive effective relative area between the capacitive transducer pole plate; Amplify capacitance at double, improve the sensitivity that detects.
In the 7th embodiment provided by the invention, as shown in Figure 9, first pole plate 81 and second pole plate 82 are set below outer pot 1 the bottom of a pan, first pole plate 81 and second pole plate 82 are in the same plane, corresponding with the bottom of a pan of outer pot 1 respectively, the bottom of a pan of outer pot 1 is stressed to change and produces elastic deformation generation displacement, and changes the electric field medium of first pole plate 81 and 82 generations of second pole plate thus, produce the capacitance variations value with this, and input to control circuit board 7.
Capacitive transducer 8 and building-out capacitor 9 input to the capacitance signal of gathering in the oscillatory circuit 711 of signal processing circuit 71, the oscillator signal of output certain frequency is to microprocessor 712, this oscillator signal exports control relay circuit plate 72 to through the output control signal that forms sensor after the adaptive algorithm adjustment in microprocessor 712, control relay circuit plate 72 is according to the signal controlling heating plate work that receives.When electric pressure cooking saucepan was worked, control circuit board 7 continued to detect, and further controlled the work of electric pressure cooking saucepan, constituted closed-loop control system.
When signal controlling output circuit 712 adopts ghyristor circuit, then adjust the silicon controlled conduction angle according to the signal of input, realize the adjusting of pressure regulation and output power by controllable silicon, reduce the heating power that increases heating plate 4 until disconnecting circuit or closed circuit gradually with the heating power of control heating plate 4 gradually.
Claims (11)
1, a kind of improved electric pressure cooking saucepan, comprise outer pot (1), be positioned over interior pot (2) in the described outer pot (1), in the sealing pot (2) packoff (3), with described in pot (2) match be used to heat described in electric heater unit (4), the safety feature (6) of pot (2), and the control circuit of controlling described electric heater unit (4) work, the bottom of a pan of described outer pot (1) is an elastic plate, it is characterized in that:
Described control circuit comprises capacitive transducer (8), signal processing circuit (71) and signal controlling output circuit (72);
Described capacitive transducer (8) comprises first pole plate (81), second pole plate (82), is respectively equipped with the signals collecting end on described first pole plate (81) and second pole plate (82); Described signals collecting end is connected with the signal receiving end of described signal processing circuit (71); Described capacitive transducer matches with described electric pressure cooking saucepan, the change in displacement that induced electricity pressure pot is stressed and change produces, and the variable signal that this change in displacement is converted to electric capacity inputed to described signal processing circuit (71);
The signal output part of described signal processing circuit (71) is connected with the signal receiving end of described signal controlling output circuit (72), described signal processing circuit (71) is handled the electric capacity signal that receives, and the signal after will handling exports described signal controlling output circuit (72) to;
Described signal controlling output circuit (72) comes control circuit according to the described processing signals that receives, and controls the work of described electric heater unit (4) with this.
2, a kind of improved electric pressure cooking saucepan according to claim 1 is characterized in that: described control circuit also comprises with the capacitive transducer capacitance and is subjected to temperature and electromagnetic interference (EMI) to change the building-out capacitor (9) of capacitance simultaneously.
3, a kind of improved electric pressure cooking saucepan according to claim 2, it is characterized in that: described building-out capacitor (9) comprises two pole plates, one of them pole plate is first pole plate (81) or second pole plate (82) of described capacitive transducer.
4, according to claim 1 or 2 or 3 described a kind of improved electric pressure cooking saucepans, it is characterized in that: described first pole plate (81) is corresponding with second pole plate (82), pot (2) is stressed to change and produces change in displacement in described, and described first pole plate of direct or indirect thus drive (81) moves in opposite directions or dorsad with respect to described second pole plate (82), distance between minimizing or increase and second pole plate (82) is with this electric capacity signal that changes.
5, a kind of improved electric pressure cooking saucepan according to claim 4, it is characterized in that: between the bottom of a pan of described outer pot (1) and described first pole plate (81) shift transmission part (10) is set, pot (2) is stressed to change and produces change in displacement in described, move in the bottom of a pan that drives described electric heater unit (4), outer pot (1), drive first pole plate (81) by described shift transmission part (10) and move, described second pole plate (82) is installed on the sidewall of described outer pot (1) by a support (12).
6, a kind of improved electric pressure cooking saucepan according to claim 5, it is characterized in that: described shift transmission part (10) is a screw rod, the bottom of a pan of described outer pot (1) and first pole plate (81) are provided with and the corresponding threaded hole of described screw rod, and described first pole plate (81) is threaded by the bottom of a pan of described screw rod with described outer pot (1).
7, a kind of improved electric pressure cooking saucepan according to claim 5, it is characterized in that: described shift transmission part (10) is a push rod, between described first pole plate (81) and second pole plate (82), be provided with and drive the elastic body (11) that first pole plate (81) moves, one end of described push rod is connected in first pole plate (81), and the other end is affixed on the bottom of a pan of outer pot (1).
8, a kind of improved electric pressure cooking saucepan according to claim 5, it is characterized in that: between described shift transmission part (10) and described first pole plate (81) leverage (13) is set, described shift transmission part (10) drives the galianconism end of described leverage (13), and long arm end drives described first pole plate (81).
9, according to claim 1 or 2 or 3 described a kind of improved electric pressure cooking saucepans, it is characterized in that: described first pole plate (81) is corresponding with second pole plate (82), pot (2) is stressed to change and produces change in displacement in described, and described first pole plate of direct or indirect thus drive (81) and/or tri-electrode (82) motion, change the effective corresponding area between first pole plate (81) and second pole plate (82), with this electric capacity signal that changes.
10, a kind of improved electric pressure cooking saucepan according to claim 9, it is characterized in that: a displacement guide rod (14) is set between the bottom of a pan of described outer pot (1) and described first pole plate (81), the two ends of described displacement guide rod (14) are connected with first pole plate (81) with the bottom of a pan of described outer pot (1) respectively, pot (2) is stressed to change and produces change in displacement in described, move in the bottom of a pan that drives described outer pot (1), the bottom of a pan of described outer pot (1) drives first pole plate (81) by described displacement guide rod (14) and moves, and described second pole plate (82) is installed on the sidewall of described outer pot (1) by a support (12).
11, a kind of improved electric pressure cooking saucepan according to claim 10, it is characterized in that: between described displacement guide rod (14) and described first pole plate (81) leverage (13) is set, described displacement guide rod (14) drives the galianconism end of described leverage (13), and long arm end drives described first pole plate (81).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710153851XA CN100470409C (en) | 2007-09-14 | 2007-09-14 | Modified electric pressure cooker |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200710153851XA CN100470409C (en) | 2007-09-14 | 2007-09-14 | Modified electric pressure cooker |
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| CN101112293A CN101112293A (en) | 2008-01-30 |
| CN100470409C true CN100470409C (en) | 2009-03-18 |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100469289C (en) * | 2007-09-14 | 2009-03-18 | 九阳股份有限公司 | Electric pressure cooker |
| CN103513679B (en) * | 2012-06-28 | 2015-08-12 | 珠海格力电器股份有限公司 | The compress control method of pressure cooker and device |
| CN108926257B (en) * | 2017-05-27 | 2023-11-24 | 佛山市顺德区美的电热电器制造有限公司 | Food amount judging device for cooking utensil and cooking utensil |
| CN110250930A (en) | 2017-08-09 | 2019-09-20 | 沙克忍者运营有限责任公司 | Cooking system |
| CN107581890B (en) * | 2017-09-25 | 2022-07-08 | 中山市斯乐得电器有限公司 | Intelligent control energy-saving electric cooker |
| USD914447S1 (en) | 2018-06-19 | 2021-03-30 | Sharkninja Operating Llc | Air diffuser |
| USD883014S1 (en) | 2018-08-09 | 2020-05-05 | Sharkninja Operating Llc | Food preparation device |
| USD903413S1 (en) | 2018-08-09 | 2020-12-01 | Sharkninja Operating Llc | Cooking basket |
| USD934027S1 (en) | 2018-08-09 | 2021-10-26 | Sharkninja Operating Llc | Reversible cooking rack |
| USD883015S1 (en) | 2018-08-09 | 2020-05-05 | Sharkninja Operating Llc | Food preparation device and parts thereof |
| US20190254476A1 (en) | 2019-02-25 | 2019-08-22 | Sharkninja Operating Llc | Cooking device and components thereof |
| CN212788226U (en) | 2019-02-25 | 2021-03-26 | 沙克忍者运营有限责任公司 | Cooking system |
| CN110013163A (en) * | 2019-05-08 | 2019-07-16 | 珠海格力电器股份有限公司 | Cooking appliance and pressure-regulating device |
| USD918654S1 (en) | 2019-06-06 | 2021-05-11 | Sharkninja Operating Llc | Grill plate |
| USD982375S1 (en) | 2019-06-06 | 2023-04-04 | Sharkninja Operating Llc | Food preparation device |
| US11647861B2 (en) | 2020-03-30 | 2023-05-16 | Sharkninja Operating Llc | Cooking device and components thereof |
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