CN204833842U - Control by temperature change teaching demonstration ware - Google Patents
Control by temperature change teaching demonstration ware Download PDFInfo
- Publication number
- CN204833842U CN204833842U CN201520382637.1U CN201520382637U CN204833842U CN 204833842 U CN204833842 U CN 204833842U CN 201520382637 U CN201520382637 U CN 201520382637U CN 204833842 U CN204833842 U CN 204833842U
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- CN
- China
- Prior art keywords
- relay
- temperature control
- thermistor
- illuminator
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
Control by temperature change teaching demonstration ware, including a rectangular box body, set up presentation device on the panel of box body, the presentation device of its characterized in that panel includes the thermistor of working power supply and electricity connection in proper order, the amplifier, the normally open contact of the rela, the illuminator, working power supply is the electric connection power supply indicator still, temperature rising thermistor resistance forms when reducing, the amplifier switch conduction makes relay circular telegram work, the light is sent in the closed illuminator of the end circular telegram of normally opening of relay, the utility model discloses a control by temperature change teaching demonstration ware simple manufacture, high durability and convenient use, it uses to be fit for middle and primary schools' science and technology practice activity and classroom teaching.
Description
Technical field
The present invention relates to teaching aid demonstration field and be specifically related to a kind of temperature control teaching demonstration device.
Background technology
Few at the instrument of rural school's demonstration at present, teacher's knowwhy outtalks to student, do not improve the enthusiasm of Students ' Learning, student loses interest in study, be weary of studying, coordinate teaching to make a kind of temperature control education demonstrator, excite students ' interest of study, be that student likes class of studying, improve the quality of teaching.
Summary of the invention
Coordinate teaching to make a kind of temperature control education demonstrator, excite students ' interest of study, be that student likes class of studying, improve the quality of teaching.
Temperature control education demonstrator, comprise a rectangular box body, the panel of box body arranges apparatus for demonstrating, it is characterized in that the apparatus for demonstrating of panel comprises working power and the thermistor be electrically connected successively, amplifier, relay, illuminator, working power is electric connection of power supply indicator also, is formed when temperature raises the reduction of thermistor resistance, amplifier switch conducting makes relay power work, and the Chang Kaiduan of relay closes illuminator energising and sends light.
Preferably, a kind of temperature control education demonstrator, is characterized in that described working power is miniature transformer step-down, diode rectification, electrochemical capacitor filtering, integrated three-terminal regulator voltage stabilizing.
Preferably, a kind of temperature control education demonstrator, it is characterized in that described miniature transformer is that 3W exports 15V, commutation diode is 1N4002, electrolytic capacitor filter is 470 μ F/25V, integrated three-terminal regulator is L7812CV.
Preferably, a kind of temperature control education demonstrator, it is characterized in that described thermistor is 20K Ω, amplifier is two C9014 type compound compositions, and power indicator is red LED light emitting diode.
Preferably, a kind of temperature control education demonstrator, it is characterized in that described relay is DC12V miniature relay, illuminator is 220V15W incandescent lamp bulb.
Accompanying drawing explanation
Fig. 1 utility model works process flow diagram.
Embodiment
Temperature control education demonstrator, comprise a rectangular box body, the panel of box body arranges apparatus for demonstrating, it is characterized in that the apparatus for demonstrating of panel comprises working power and the thermistor be electrically connected successively, amplifier, relay, illuminator, working power is electric connection of power supply indicator also, is formed when temperature raises the reduction of thermistor resistance, amplifier switch conducting makes relay power work, and the Chang Kaiduan of relay closes illuminator energising and sends light.
Working power selects 3W to export the miniature transformer of 15V, rectifier is the rectifier that four 1N4002 diode bridge are formed by connecting, and wave filter is the capacitor filter of 470 μ F/25V, and voltage stabilizer model is 7812 three terminal regulators, thermistor is 20K Ω, amplifier is two C9014 triode compound compositions, and common compact relay selected by relay, and red color LED diode is power indicator, the incandescent lamp bulb of 220V15W selected by illuminator, make wiring board, welding circuit, assembles.
The miniature transformer that principle of work: 3W exports 15V reduces 220V alternating voltage as 15V low-voltage AC, by four 1N4002 bridge rectifiers, the capacitor filter wave filter of 470 μ F/25V, 7812 three terminal regulator voltage stabilizings export 12V galvanic current, after electronic component energising, the resistance size of thermistor changes by temperature controls, under certain operating voltage, temperature raises its resistance and reduces, temperature reduces its resistance and raises, its resistance change export voltage levels change, when temperature raises certain heat, what export is amplified by amplifier (two C9014 triode compound compositions), pilot relay work 220V incandescent lamp bulb is lighted, when the temperature decreases, amplifier makes relay not work, 220V incandescent lamp bulb is lighted.
During demonstration, to grasp on panel thermistor or be thermistor with well heater, 220V incandescent lamp bulb is lighted for a moment, and hand or well heater leave thermistor, and 220V incandescent lamp bulb extinguishes.
Claims (5)
1. temperature control education demonstrator, comprise a rectangular box body, the panel of box body arranges apparatus for demonstrating, it is characterized in that the apparatus for demonstrating of panel comprises working power and the thermistor be electrically connected successively, amplifier, relay, illuminator, working power is electric connection of power supply indicator also, is formed when temperature raises the reduction of thermistor resistance, amplifier switch conducting makes relay power work, and the Chang Kaiduan of relay closes illuminator energising and sends light.
2. temperature control education demonstrator as claimed in claim 1, is characterized in that described working power is miniature transformer step-down, diode rectification, electrochemical capacitor filtering, integrated three-terminal regulator voltage stabilizing four subelement composition.
3. temperature control education demonstrator as claimed in claim 2, is characterized in that described miniature transformer is that 3W exports 15V, commutation diode is 1N4002, electrolytic capacitor filter is 470 μ F/25V, integrated three-terminal regulator is L7812CV.
4. temperature control education demonstrator as claimed in claim 1, is characterized in that described thermistor is 20K Ω, and amplifier is two C9014 type triode compound compositions, and power indicator is red LED light emitting diode.
5. temperature control education demonstrator as claimed in claim 1, it is characterized in that described relay is DC12V miniature relay, illuminator is 220V15W incandescent lamp bulb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520382637.1U CN204833842U (en) | 2015-06-08 | 2015-06-08 | Control by temperature change teaching demonstration ware |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520382637.1U CN204833842U (en) | 2015-06-08 | 2015-06-08 | Control by temperature change teaching demonstration ware |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204833842U true CN204833842U (en) | 2015-12-02 |
Family
ID=54691415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520382637.1U Expired - Fee Related CN204833842U (en) | 2015-06-08 | 2015-06-08 | Control by temperature change teaching demonstration ware |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204833842U (en) |
-
2015
- 2015-06-08 CN CN201520382637.1U patent/CN204833842U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 Termination date: 20160608 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |