CN101393061A - Pressure detection device for electric pressure cooker - Google Patents
Pressure detection device for electric pressure cooker Download PDFInfo
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- CN101393061A CN101393061A CNA2008100606247A CN200810060624A CN101393061A CN 101393061 A CN101393061 A CN 101393061A CN A2008100606247 A CNA2008100606247 A CN A2008100606247A CN 200810060624 A CN200810060624 A CN 200810060624A CN 101393061 A CN101393061 A CN 101393061A
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Abstract
The invention discloses a pressure detection device for an electric pressure cooker, which comprises a resistance strain gauge, a signal amplification circuit, and a pressure control system used for realizing pressure detection and control, wherein the resistance strain gauge comprises a resistance strain chip and an elastic substrate, the resistance strain chip is adhered to the elastic substrate, the resistance strain gauge is arranged at the position on which a cooker cover of the electric pressure cooker is communicated with air pressure in the cooker, the resistance strain chip is connected with the signal amplification circuit, the signal amplification circuit is connected with the pressure control system, and the pressure control system comprises a pressure detection module used for calculating a pressure value corresponding to a current detection signal according to the proportional linear relation between the detection signal and the pressure. The pressure detection device for the electric pressure cooker has simple debugging, is suitable for mass production, and has high detection accuracy.
Description
Technical field
The present invention relates to the electric pressure cooking saucepan technical field, especially a kind of pressure detection device for electric pressure cooker.
Background technology
Present most electric pressure cooking saucepan is a kind of intelligent electric pressure cooking saucepan, by MCU control function program work.In order to make function obtain better effect and to make electric pressure cooking saucepan safer.People have adopted many controls, have detected the method for pot inner pressure.At present, the electric pressure cooking saucepan pressure measurement generally adopts thermistor temperature sensor to place a pot top to measure kettle temperature, is converted to barometric information then and comes the control function program by single-chip microcomputer.We know, the pressure in the electric pressure cooking saucepan is interior all relevant by the factors such as character of cooking with temperature, pot in the pot, that is to say that the height of kettle temperature is not unique factor that influences pot inner pressure.Determine pot inner pressure iff detecting kettle temperature, error is quite big, can not in time reflect a pot interior true pressure.Thereby make calling program can not in time obtain the accurate pressure data, the perfection that influences function program realizes.
The method and apparatus that open employing strain gauge detection pressure is also arranged in the prior art, see Chinese invention patent 200510100475.9, patent name: " a kind of pressure detection method of electric pressure cooking saucepan and pick-up unit " (day for announcing is 2006.4.26), this technical scheme mainly is to utilize the swell increment of pot in the strainometer perception, interior pot swell increment is converted to a displacement realizes control, but this scheme is limited bigger, because the component content difference and the thickness deviation of interior pot material, the material content difference and the thickness deviation that comprise the bottom heat-generating disc all can cause error to detection, need each product is adjusted the debugging trouble during production; And in case take place unusually in using, heat-generating disc can produce serious thermal deformation, causes detecting error occurring, still can not reach the purpose of accurate detection and control pot inner pressure.
Summary of the invention
Need debug, be unfavorable for producing in batches, detecting the deficiency of degree of accuracy difference when overcoming the production of existing pressure detection device for electric pressure cooker one by one, the invention provides a kind of debug simple, be applicable to batch process, the pressure detection device for electric pressure cooker that accuracy of detection is high.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of pressure detection device for electric pressure cooker, comprise strain ga(u)ge, signal amplification circuit and the control pressurer system that is used to realize pressure detection and control, described strain ga(u)ge comprises resistance strain gage and elastic matrix, described resistance strain gage is bonded on the described elastic matrix, described strain ga(u)ge is installed in the place that communicates with the pot internal gas pressure of electric pressure cooking saucepan pot cover, described strain ga(u)ge and signal amplification circuit, described signal amplification circuit connects described control pressurer system, described control pressurer system comprises: be used for the direct proportion linear relationship according to detection signal and pressure, calculate the pressure detection module of the force value of current detection signal correspondence.
Further, described pressure-detecting device also comprises the electric-powered air release valve that is installed in the pot cover, described control pressurer system also comprises: be used to set needed force value, be greater than or less than force value, the unlatching of control electric-powered air release valve or the pressure adjusting module of closing of program setting as the force value of current detection signal correspondence.
Suit anti-block apparatus outside described electronics strainometer.
Technical conceive of the present invention is: electric pressure cooking saucepan comprises common electrical pressure pot body and internal circuit, sensor, display operating panel and source program, and described circuit is made up of pressure-detecting device, signal amplification circuit, single-chip microcomputer, control circuit and power unit.Single-chip microcomputer can be the single-chip microcomputer that band A/D detects, and the single-chip microcomputer that can not detect with A/D does not need special A/D testing circuit with the single-chip microcomputer that A/D detects yet.Strain ga(u)ge is sticked on the elastic matrix, and the baroceptor of making is installed to the place that pot cover or pot body etc. communicate with the pot internal gas pressure, signal Processing is amplified the back detect a mouthful detectable voltage signals by Chip Microcomputer A/D.The employing of said method makes pressure in the electric pressure cooking saucepan, can cause the change in resistance of foil gauge by the microdeformation of elastic matrix structural member, be transformed into enough big voltage signal by signal amplification circuit and export, thereby by the continuous measurement of single-chip microcomputer.The use of this method has improved pressure detection precision and hierarchical detection precision in the electric pressure cooking saucepan greatly, and can continuity detect and accurate demonstration pot inner pressure value, and can accurately control the force value in the electric pressure cooking saucepan in good time.
Beneficial effect of the present invention mainly shows: 1, debug simply, be applicable to batch process, accuracy of detection height; 2, the linearity is good, helps the electric pressure cooking saucepan function program and better realizes; 3, can accurately show the pot inner pressure value in good time; 4,, also can carry out in good time accurately control to pot inner pressure as installing the electric-powered air release valve of pressure cooker additional; 5, whole device pressure measurement is simple and easy to do, is suitable for factory's volume production, and the present invention not only can be used for the electric pressure cooking saucepan and the low pressure electric cooker of common electric heating disc type, also can be used for the electric pressure cooking saucepan and the IH low pressure electric cooker of IH induction heating technique.
Description of drawings
Fig. 1 is the structural representation of pressure detection device for electric pressure cooker.
Fig. 2 is the circuit diagram of signal amplification circuit.
Fig. 3 is the proportional relationship synoptic diagram between air pressure 0-150KPa and the voltage 0-5V.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
See figures.1.and.2, a kind of pressure detection device for electric pressure cooker, comprise strain ga(u)ge 1, signal amplification circuit and the control pressurer system 2 that is used to realize pressure detection and control, described strain ga(u)ge 1 comprises resistance strain gage and elastic matrix, described resistance strain gage is bonded on the described elastic matrix, described strain ga(u)ge 1 is installed in the place that communicates with the pot internal gas pressure of electric pressure cooking saucepan pot cover 3, described resistance strain gage and signal amplification circuit, described signal amplification circuit connects described control pressurer system, described control pressurer system comprises: resistance strain gage is bonded at the strain ga(u)ge 1 of forming pressure measurement on the suitable elastic matrix, signal amplifier (reference circuit) Fig. 2, Single Chip Microcomputer (SCM) system, electric-powered air release valve 4.Its principle of whole control pressurer system is:
When the pressure cooker internal gas pressure is normal pressure, the voltage of the signal amplifier that is connected with strain ga(u)ge is in zero-point voltage, when kettle temperature raises with the air pressure rising, the gaseous tension that expands can make resistance strain gage produce elastic deformation by elastic matrix, be noted that especially, because strainometer adopts the high temperature compensation technique, makes temperature very little to the influence of strainometer output signal.Accordingly, when the pot internal gas pressure reduced, the deformability of resistance strain gage reduced.The deformation of strainometer causes changes in resistance, by conversion and the amplification of signal amplification circuit to signal, (strainometer is seen Fig. 2 with the circuit diagram that is connected of signal amplification circuit), the A/D testing circuit of single-chip microcomputer can detect voltage signal in real time.According to the corresponding direct proportion linear relationship of detection signal,, just can know the current pressure value in the pot by the computing of single-chip microcomputer with pressure.Get differently according to the required atmospheric pressure value of different functions, engineering technical personnel's coding can increase force value by control electric hot tray heating, makes the pot inner pressure value be controlled at a suitable scope by stopping to heat or increase devices such as electric-powered air release valve.The high temperature compensation method of strain ga(u)ge is: strain ga(u)ge adopts 0-150 ℃ high temperature dummy gauge, this foil gauge be select for use be subjected to temperature-coefficient of electrical resistance little the specific alloy material make by proper heat treatment technology.
Single Chip Microcomputer (SCM) system is used for calculating the current corresponding force value of detection signal according to detection signal with the corresponding direct proportion linear relationship of pressure.Described direct proportion linear relationship is meant: when the pressure cooker internal gas pressure was normal pressure (promptly placing under the atmospheric pressure), the voltage of the signal amplifier that is connected with strain ga(u)ge was in zero-point voltage, and the detected voltage of single-chip microcomputer this moment is zero, and being considered as air pressure is zero.After strain ga(u)ge 1 is made, through the professional equipment test, can determine the range ability of strain ga(u)ge, general according to maximum pressure value (as 150KPA) with a little higher than electric pressure cooking saucepan operate as normal, the output voltage signal of strain ga(u)ge 1 is assumed to be A when measuring 150KPA, the A value is generally the MV level, very faint, can not be by the monolithic machine testing, through signal amplifier this voltage signal is carried out direct proportion and amplify (enlargement factor of modelled signal amplifier according to actual needs), suppose that output voltage signal A according to design needs strain ga(u)ge 1 during with 150KPA amplifies the back and is the 5V (enlargement factor that this magnitude of voltage can come the modelled signal amplifier according to the parameter and the actual needs of single-chip microcomputer, so long as reasonable value just can, the signal amplification circuit figure that provides among Fig. 2 is a reference circuit.) then we can be at proportional relationship formula of corresponding one-tenth between air pressure 0-150KPA and the voltage 0-5V, example such as Fig. 3.
Described pressure-detecting device also comprises the electric-powered air release valve 4 that is installed in the pot cover, described control pressurer system also comprises: the force value that is used to set needs, force value as current detection signal correspondence is greater than or less than force value, the pressure adjusting module that control electric-powered air release valve 4 is opened or closed.Suit anti-block apparatus 5 outside described electronics strainometer.
The control pressurer system 2 of present embodiment places in pot body or the loam cake, and pot cover and electronics strainometer junction are provided with anti-block apparatus 5, is provided with 4 pairs of pot inner pressures of electric-powered air release valve in the loam cake and controls in good time.
The electronics strainometer 1 of present embodiment comprises resistance strain gage and elastic matrix, both can adopt the middle high temperature strain foil that has good temperature compensation coefficient when working more than the temperature for 100 ℃ by bonding, the described resistance strain gage of special bonding agent, also can adopt a plurality of normal temperature (80 ℃) foil gauge to form the normal temperature foil gauge that has good temperature compensation coefficient when working more than the temperature for 100 ℃.Described elastic matrix structural member is a kind of elastically-deformable matrix of possessing of foil gauge that is used to paste, and material is generally aluminium, aluminium alloy or stainless steel, and elastic matrix elasticity and physical strength are fit to.To be resistance change that foil gauge is faint be suitable for the voltage signal that single-chip microcomputer detects by conversion with zooming into to described signal amplification circuit.Described resistance strain gage sticks on the elastic matrix, and described strain ga(u)ge is installed on the pot cover and with the pot internal gas pressure and communicates, and described strain ga(u)ge connects signal amplification circuit, and described signal amplification circuit connects control pressurer system.Described control pressurer system includes single-chip microcomputer, power unit, display device and source program, as need pot inner pressure is adjusted in good time, then can further install the electric-powered air release valve of pressure cooker additional.
Pressure in the electric pressure cooking saucepan of present embodiment can cause by the microdeformation of elastic matrix structural member to be transformed into the change in resistance of foil gauge enough big voltage signal by signal amplification circuit and to export, thereby by the continuous measurement of single-chip microcomputer.
With reference to Fig. 2 is the circuit diagram of signal amplification circuit.The power supply of resistance strain type pressure sensor can be powered by+12V original by the electric pressure cooking saucepan internal circuit, carrying out signal through amplifying circuit amplifies, receive Chip Microcomputer A/D and detect mouth, single-chip microcomputer detect voltage signal promptly as can be known the pot in actual pressure value, function program makes function program perfectly be realized according to recording force value control heating process in real time.
Claims (3)
1, a kind of pressure detection device for electric pressure cooker, it is characterized in that: described pressure-detecting device comprises strain ga(u)ge, signal amplification circuit and the control pressurer system that is used to realize pressure detection and control, described strain ga(u)ge comprises resistance strain gage and elastic matrix, described resistance strain gage is bonded on the described elastic matrix, described strain ga(u)ge is installed in the place that communicates with the pot internal gas pressure of electric pressure cooking saucepan pot cover, described resistance strain gage and signal amplification circuit, described signal amplification circuit connects described control pressurer system, described control pressurer system comprises: be used for the direct proportion linear relationship according to detection signal and pressure, calculate the pressure detection module of the force value of current detection signal correspondence.
2, pressure detection device for electric pressure cooker as claimed in claim 1, it is characterized in that: described pressure-detecting device also comprises the electric-powered air release valve that is installed in the pot cover, described control pressurer system also comprises: be used to set needed force value, force value as current detection signal correspondence is greater than or less than force value, the pressure adjusting module that the control electric-powered air release valve is opened or closed.
3, pressure detection device for electric pressure cooker as claimed in claim 1 or 2 is characterized in that: suit anti-block apparatus outside described electronics strainometer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100606247A CN101393061B (en) | 2008-04-14 | 2008-04-14 | Pressure detection device for electric pressure cooker |
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| CN2008100606247A CN101393061B (en) | 2008-04-14 | 2008-04-14 | Pressure detection device for electric pressure cooker |
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| CN101393061A true CN101393061A (en) | 2009-03-25 |
| CN101393061B CN101393061B (en) | 2011-08-03 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104414439A (en) * | 2013-09-02 | 2015-03-18 | 美的集团股份有限公司 | Electric pressure cooker and control device and method thereof |
| CN104688023A (en) * | 2013-12-04 | 2015-06-10 | 广东美的生活电器制造有限公司 | Pressure cooking tool and control method thereof |
| CN105444946A (en) * | 2014-09-02 | 2016-03-30 | 佛山市顺德区美的电热电器制造有限公司 | Electric pressure cooker, and pressure detecting method and pressure detecting device used for same |
| CN107450635A (en) * | 2017-08-25 | 2017-12-08 | 深圳市阳邦电子股份有限公司 | A kind of application circuit of electronic high-voltage pot, method |
| CN108344536A (en) * | 2017-01-24 | 2018-07-31 | 浙江苏泊尔家电制造有限公司 | Pressure sensor and cooking apparatus for cooking apparatus |
| WO2018157409A1 (en) * | 2017-03-01 | 2018-09-07 | 佛山市顺德区美的电热电器制造有限公司 | Pressure control method for cooking utensil |
-
2008
- 2008-04-14 CN CN2008100606247A patent/CN101393061B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104414439A (en) * | 2013-09-02 | 2015-03-18 | 美的集团股份有限公司 | Electric pressure cooker and control device and method thereof |
| CN104688023A (en) * | 2013-12-04 | 2015-06-10 | 广东美的生活电器制造有限公司 | Pressure cooking tool and control method thereof |
| CN105444946A (en) * | 2014-09-02 | 2016-03-30 | 佛山市顺德区美的电热电器制造有限公司 | Electric pressure cooker, and pressure detecting method and pressure detecting device used for same |
| CN105444946B (en) * | 2014-09-02 | 2020-06-19 | 佛山市顺德区美的电热电器制造有限公司 | Pressure detection method and pressure detection device for electric pressure cooker and electric pressure cooker |
| CN108344536A (en) * | 2017-01-24 | 2018-07-31 | 浙江苏泊尔家电制造有限公司 | Pressure sensor and cooking apparatus for cooking apparatus |
| WO2018157409A1 (en) * | 2017-03-01 | 2018-09-07 | 佛山市顺德区美的电热电器制造有限公司 | Pressure control method for cooking utensil |
| CN107450635A (en) * | 2017-08-25 | 2017-12-08 | 深圳市阳邦电子股份有限公司 | A kind of application circuit of electronic high-voltage pot, method |
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| CN101393061B (en) | 2011-08-03 |
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