CN100469289C - Electric pressure cooker - Google Patents

Electric pressure cooker Download PDF

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Publication number
CN100469289C
CN100469289C CNB2007101538492A CN200710153849A CN100469289C CN 100469289 C CN100469289 C CN 100469289C CN B2007101538492 A CNB2007101538492 A CN B2007101538492A CN 200710153849 A CN200710153849 A CN 200710153849A CN 100469289 C CN100469289 C CN 100469289C
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CN
China
Prior art keywords
pole plate
pot
heater unit
electric heater
capacitance
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Application number
CNB2007101538492A
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Chinese (zh)
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CN101112291A (en
Inventor
朱泽春
蒋吉猛
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九阳股份有限公司
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Application filed by 九阳股份有限公司 filed Critical 九阳股份有限公司
Priority to CNB2007101538492A priority Critical patent/CN100469289C/en
Publication of CN101112291A publication Critical patent/CN101112291A/en
Application granted granted Critical
Publication of CN100469289C publication Critical patent/CN100469289C/en

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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/08Pressure-cookers; Lids or locking devices specially adapted therefor
    • A47J27/086Pressure-cookers; Lids or locking devices specially adapted therefor with built-in heating means

Abstract

The invention provides an electric pressure cooker, comprising an outer cooker, an inner cooker, a heating device, an elastic cell, a sealing device, a safety device and a control circuit which controls the pressure cooker to work. Besides, the invention also comprises a capacitance sensor, wherein the capacitance sensor comprises a first polar plate and a second polar plate, the heating dish is dislocated by the pressure to drive the first polar plate to move corresponding to the second polar plate, the signal of the capacitance change value is generated by changing the distance between the two polar plates, then the signal is 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 chosen 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

A kind of electric pressure cooking saucepan
Technical field
The present invention relates to a kind of pressure cooker, particularly a kind of 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 heater.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 heater.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 sealing ring 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, elastomer and pressure switch, being provided with elastomer between described heat-generating disc and the outer pot bottom is connected, also be provided with the elastomer distortion on the heat-generating disc and can touch the catch bar of pressure switch, described elastomer 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 elastomer 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 sensor is set, and comes variations in temperature or pressure in the perception pot to change, and signal is inputed to circuit detects control.Quit work when pot inner pressure reaches setting pressure, pressure restarts work when falling after rise.
In this scheme, pressure sensor 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 inductance coil to be set, and pot is stressed and changes the inductance value that the displacement that produces changes inductance coil 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 an inductance coil 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 inductance coil, 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 inductance coil 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 actual working pressure, 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 inductance coil also higher.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the invention provides a kind of electric pressure cooking saucepan.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 electric pressure cooking saucepan, comprise outer pot, be positioned over interior pot in the described outer pot, in the sealing pot sealing device, with described in pot match be used to heat described in pot electric heater unit, between described electric heater unit and outer pot, be provided with make in pot flexible member, the safety device that reset, and the control circuit of controlling described electric heater unit work, described control circuit comprises capacitance sensor, signal processing circuit and signal controlling output circuit; Described capacitance sensor 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 capacitance sensor 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 capacitance 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 capacitance 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 adopts following attached technical scheme: described control circuit also comprises the building-out capacitor that the capacitance of capacitance and capacitance sensor takes place simultaneously, changes simultaneously when being subjected to temperature and electromagnetic interference;
Described building-out capacitor comprises two pole plates, and one of them pole plate is first pole plate or second pole plate of described capacitance sensor;
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 capacitance signal that changes;
Between described electric heater unit and described first pole plate shift transmission part is set, described interior pot is stressed to change and produces change in displacement, drives described electric heater unit and moves, and described electric heater unit drives first pole plate by described shift transmission part and moves;
Described shift transmission part is a screw rod, and the described electric heater unit and/or first pole plate are provided with and the corresponding screwed hole of described screw rod, and described first pole plate is threaded with described electric heater unit mutually by described screw rod;
Described shift transmission part is a push rod, between described first pole plate and second pole plate, be provided with and drive the elastomer that first pole plate moves, one end of described push rod is connected in the bottom or first pole plate of described electric heater unit, and the other end is affixed on the bottom of first pole plate or electric heater unit;
Described second pole plate is installed on described outer pot bottom or is installed on by a support on the sidewall of described 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;
Electric heater unit and outside described first pole plate and second pole plate are set between the pot bottom, described first pole plate and second pole plate are in the same plane, corresponding with described electric heater unit respectively, described electric heater unit 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 capacitance signal that changes;
Between described electric heater unit and described first pole plate displacement guide rod is set, the two ends of described displacement guide rod are connected with the described electric heater unit and/or first pole plate respectively, pot is stressed to change and produces change in displacement in described, driving described electric heater unit moves, described electric heater unit drives first pole plate by described displacement guide rod and moves, and described second pole plate is installed on described outer pot bottom or is installed on by a support on the sidewall of described outer pot;
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 capacitance sensor, and the variation that pot or heating plate are stressed in utilizing produces displacement, gathers the capacitance that changes, and capacitance is carried out judgment processing, the work of control electric pressure cooking saucepan.The capacitance sensor 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 multi-parameter information such as pressure, times, even make the controlling organization 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) capacitance sensor 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 capacitance sensor of the present invention is connected with interior pot or heating plate, and the displacement that the variation that pot or heating plate are stressed in utilizing produces forms the capacitance variations value.Displacement is converted to capacitance detects the interior pressure of pot, need not to resemble pressure sensor or temperature sensor and be 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 capacitance sensor, building-out capacitor can respond in real time because the capacitance variations that factors such as temperature, electromagnetic interference produce, calculate by processing of circuit, can compensate the measured value of revising capacitance sensor, 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 of capacitance sensor and interior pot or heating plate, utilizes the amplification principle of lever to drive distance between the capacitance sensor pole plate; Perhaps the pole plate with capacitance sensor is provided with the area that multilayer increases pole plate, amplifies capacitance at double, improves the sensitivity that detects.
(6) capacitance sensor is with low cost, simple in structure, is easy to produce in batches.
(7) pole plate of capacitance sensor of the present invention and heating plate adopt screw rod to be connected, can by adjusting screw(rod) control between pole plate distance realization capacitance sensor polar plate spacing from fine setting.Improve the sensitivity and the precision of capacitance sensor.
Description of drawings
Fig. 1 is the whole cut-away view of first embodiment of the invention; Illustrate elastic plate drive the capacitance sensor pole plate change polar plate spacing from, capacitance sensor 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 heater drive the capacitance sensor pole plate change polar plate spacing from, capacitance sensor and building-out capacitor are located on the support, capacitance sensor 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 heater drive the capacitance sensor pole plate change polar plate spacing from, capacitance sensor 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 heater by leverage drive the capacitance sensor pole plate change polar plate spacing from, capacitance sensor 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; Heater is shown drives area between capacitance sensor pole plate change pole plate, capacitance sensor 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; Heater is shown drives area between capacitance sensor pole plate change pole plate by leverage, capacitance sensor 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; Heater changes the electric field medium that forms between two pole plates of capacitance sensor by upper and lower displacement technical scheme is shown;
Figure 10 adopts the structure cut-away view of many groups form for capacitance sensor 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;
The specific 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:
Outer pot 1, interior pot 2, sealing device 3, electric heater unit 4, flexible member 5, safety device 6, control circuit board 7, capacitance sensor 8, first pole plate 81, second pole plate 82, building-out capacitor 9, first pole plate 91, second pole plate 92, shift transmission part 10, elastomer 11, support 12, leverage 13, displacement guide rod 14, pot cover 15, handle 16, shell 17, compression spring 18
Extremely shown in Figure 14 as Fig. 1, be a kind of 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 sealing device 3, match with interior pot 2 be used to heat in pot 2 electric heater unit 4, between electric heater unit 4 and outer pot 1, be provided with make in pot 2 flexible members that reset 5, safety device 6, and control the control circuit that electric heater unit 4 is worked.Control circuit comprises capacitance sensor 8, signal processing circuit 71 and signal controlling output circuit 72.
Capacitance sensor 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.Capacitance sensor 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 capacitance 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 capacitance 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 capacitance sensor 8 takes place simultaneously, changes simultaneously when being subjected to temperature and electromagnetic interference.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 capacitance sensor.The present invention is provided with building-out capacitor 9 on the basis of capacitance sensor 8, building-out capacitor 9 can respond in real time because the capacitance variations that factors such as temperature, electromagnetic interference produce, calculate by processing of circuit, can compensate the measured value of revising capacitance sensor 8, 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.
First pole plate 81 of capacitance sensor 8 is corresponding with second pole plate 82.In pot 2 be stressed and change produce change in displacement, and direct or indirect thus drive first pole plate 81 moves in opposite directions or dorsad with respect to second pole plate 82, reduce or increase and second pole plate 82 between distance, with this capacitance signal that changes.Between the electric heater unit 4 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 drives first pole plate 81 by shift transmission part 10 and moves.
Produce change in displacement for interior pot 2 variation that is stressed, directly drive the scheme that first pole plate 81 moves in opposite directions or dorsad with respect to second pole plate 82, to on first pole plate 81, a push rod be set, push rod through heating device 4 directly contacts with interior pot 2 thes bottom of a pan, and being stressed at interior pot 2 drives first pole plate 81 by push rod when moving up and down and move up and down.This structure realizes relatively difficulty in the production of reality, making.The electric pressure cooking saucepan that adopts this structure is also seldom arranged in the product of reality.The present invention is only here with this scheme of text description exploitativeness in theory in event, but owing in actual production, do not have practical significance, so do not provide accompanying drawing to describe in addition.
In each embodiment provided by the invention, electric heater unit 4 is the cast aluminium heating plate, also can be electromagnetic coil assembly, and sealing device 3 is " people " font sealing ring, safety device 6 comprise as shown in Fig. 5, Fig. 6 pressure limiting valve or etc. the structure of same-action.The effect that safety device 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 sealing ring 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, and an elastic plate is installed below heating plate 4, and this elastic plate is flexible member 5.The two ends of elastic plate 5 are fixed on the sidewall of outer pot 1.Between outer pot 1 and shell 17, the bottom of shell 17 is provided with capacitance sensor 8 and building-out capacitor 9, in this programme, capacitance sensor 8 is a complex form with building-out capacitor 9, and second pole plate 82 of capacitance sensor 8 is all a pole plate with second pole plate 92 of building-out capacitor 9.First pole plate 81 of capacitance sensor 8 is connected with elastic plate 5 by shift transmission part 10.In the present embodiment, shift transmission part 10 is a connecting rod.Interior pot 2 is stressed and moves up and down, driving elastic plate 5 by the heating plate 4 that fits tightly with it moves down, elastic plate 5 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 electric heater unit 4 and/or first pole plate 81 are provided with and the corresponding screwed hole of screw rod, and first pole plate 81 is threaded with electric heater unit 4 mutually by screw rod.
As shown in Figure 2, for realizing a structure chart of second embodiment of the invention.Flexible member 5 is for being fixed in the U-shaped shell fragment between outer pot 1 and the interior pot 2.Capacitance sensor 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 capacitance sensor 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 9 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 other end is threaded mutually with heating plate 4.Moving up and down by shift transmission part 10 drives first pole plate 81 of pot 2 moved with respect to second pole plate 82 in heating plate 4 was subjected to, and produced the capacitance variations value with this, inputed 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 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 heating plate 4, in actual use, can transmit the degree of depth that part 10 (being screw rod) control stretches into screwed 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.Flexibility, compliance is better.
As shown in Figure 3, for realizing another structure chart of second embodiment of the invention.Capacitance sensor 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 capacitance sensor and the housing of building-out capacitor.Connecting support 12 then realizes 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 capacitance sensor 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 capacitance sensor 8.
When the housing that drives mutually compound capacitance sensor 8 and building-out capacitor 9 at heating plate 4 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 capacitance sensor 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.
Shift transmission part 10 is a push rod, between first pole plate 81 and second pole plate 82, be provided with and drive the elastomer 11 that first pole plate 81 moves, one end of push rod is connected in the bottom or first pole plate 81 of electric heater unit 4, and the other end is affixed on the bottom of first pole plate 81 or electric heater unit 4.
In the present invention, capacitance sensor 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.Elastomer 11 is a S shape shell fragment, and elastomer 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 capacitance sensor 8, fits in the bottom of the other end and heating plate 4.When work, heating plate 4 moves down, drive moves down with the push rod 10 of its applying, 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 heating plate 4 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 push rod 10 continuation maintenances and heating plate 4 bottoms, 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 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 capacitance sensor 8.
In the provided by the invention the 4th implements, as shown in Figure 5, capacitance sensor 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 heating plate 4 moved up and down, the shortwall end that shift transmission part 10 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 distance between the capacitance sensor 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 capacitance sensor 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, interior pot 2 is stressed to change and produces change in 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 capacitance signal that changes.
As shown in Figure 6, for realizing a structure chart of fifth embodiment of the invention.Capacitance sensor 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 capacitance sensor 8 and building-out capacitor 9 and the heating plate.Between the heating plate 4 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 heating plate 4 respectively, interior pot 2 is stressed to change and produces change in displacement, driving heating plate 4 moves, heating plate 4 drives first pole plate 81 by displacement guide rod 14 and moves 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 structure chart of fifth embodiment of the invention for another.In structure chart, one end of displacement guide rod 14 is connected with heating plate 4 bottom thread, the other end fits on the sidewall of first pole plate 81 of capacitance sensor 8, against a compression spring 18, the other end of compression spring 18 is fixed in the housing of mutually compound capacitance sensor 8 and building-out capacitor 9 on another sidewall of first pole plate 81.When heating plate 4 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 heating plate 4 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 heating plate 4, 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 capacitance sensor 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 between heating plate 4 and outer pot 1 bottom, first pole plate 81 and second pole plate 82 are in the same plane, corresponding with heating plate 4 respectively, heating plate 4 is produced mobile by the variation of interior pot 2 displacements, 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.
Control circuit board 7 in each embodiment that the present invention provides, as Figure 13, shown in Figure 14, the control circuit of control circuit board 7 comprises signal processing circuit 71, signal controlling output circuit 72.Signal processing circuit 71 comprises oscillating circuit 711 and microprocessor 712.Signal controlling output circuit 72 is control relay circuit or ghyristor circuit.
Capacitance sensor 8 and building-out capacitor 9 input to the capacitance signal of gathering in the oscillating 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 angle of flow according to the signal of input, realize the adjusting of pressure regulation and power output 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 (13)

1, a kind of 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) sealing device (3), with described in pot (2) match be used to heat described in pot (2) electric heater unit (4), setting makes flexible member (5), the safety device (6) that interior pot (2) reset between described electric heater unit (4) and outer pot (1), and the control circuit of controlling described electric heater unit (4) work, it is characterized in that:
Described control circuit comprises capacitance sensor (8), signal processing circuit (71) and signal controlling output circuit (72);
Described capacitance sensor (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 capacitance sensor (8) 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 capacitance 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 capacitance 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 electric pressure cooking saucepan according to claim 1 is characterized in that: described control circuit also comprises with the capacitance sensor capacitance and is subjected to temperature and electromagnetic interference to change the building-out capacitor (9) of capacitance simultaneously.
3, a kind of electric pressure cooking saucepan according to claim 2 is characterized in that: described 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 described capacitance sensor.
4, according to claim 1 or 2 or 3 described a kind of 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 capacitance signal that changes.
5, a kind of electric pressure cooking saucepan according to claim 4, it is characterized in that: between described electric heater unit (4) 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, drive described electric heater unit (4) and move, described electric heater unit (4) drives first pole plate (81) by described shift transmission part (10) and moves.
6, a kind of electric pressure cooking saucepan according to claim 5 is characterized in that; Described shift transmission part (10) is a screw rod, and described electric heater unit (4) and/or first pole plate (81) are provided with and the corresponding screwed hole of described screw rod, and described first pole plate (81) is threaded with described electric heater unit (4) mutually by described screw rod.
7, a kind of 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 elastomer (11) that first pole plate (81) moves, one end of described push rod is connected in the bottom or first pole plate (81) of described electric heater unit (4), and the other end is affixed on the bottom of first pole plate (81) or electric heater unit (4).
8, a kind of electric pressure cooking saucepan according to claim 4 is characterized in that: described second pole plate (82) is installed on described outer pot (1) bottom or is installed on the sidewall of described outer pot (1) by a support (12).
9, a kind of 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).
10, according to claim 1 or 2 or 3 described a kind of electric pressure cooking saucepans, it is characterized in that: between electric heater unit (4) and outer pot (1) bottom, described first pole plate (81) and second pole plate (82) are set, described first pole plate (81) is in the same plane with second pole plate (82), corresponding with described electric heater unit (4) respectively, described electric heater unit (4) is produced mobile by the variation of interior pot displacement, and changes the electric field medium of first pole plate (81) and second pole plate (82) generation thus.
11, according to claim 1 or 2 or 3 described a kind of 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 second pole plate (82) motion, change the effective corresponding area between first pole plate (81) and second pole plate (82), with this capacitance signal that changes.
12, a kind of electric pressure cooking saucepan according to claim 11, it is characterized in that: a displacement guide rod (14) is set between described electric heater unit (4) and described first pole plate (81), the two ends of described displacement guide rod (14) are connected with first pole plate (81) with described electric heater unit (4) respectively, pot (2) is stressed to change and produces change in displacement in described, driving described electric heater unit (4) moves, described electric heater unit (4) drives first pole plate (81) by described displacement guide rod (14) and moves, and described second pole plate (82) is installed on described outer pot (1) bottom or is installed on the sidewall of described outer pot (1) by a support (12).
13, a kind of electric pressure cooking saucepan according to claim 12, 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).
CNB2007101538492A 2007-09-14 2007-09-14 Electric pressure cooker CN100469289C (en)

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CNB2007101538492A CN100469289C (en) 2007-09-14 2007-09-14 Electric pressure cooker
PCT/CN2008/001519 WO2009036653A1 (en) 2007-09-14 2008-08-22 Electrical pressure cooker
KR1020107005461A KR20100061801A (en) 2007-09-14 2008-08-22 Electrical pressure cooker
JP2010524332A JP2010538708A (en) 2007-09-14 2008-08-22 Electric pressure cooker

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KR20100061801A (en) 2010-06-09

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