CN202501931U - Temperature alarm for rice seedling bed - Google Patents
Temperature alarm for rice seedling bed Download PDFInfo
- Publication number
- CN202501931U CN202501931U CN 201220087119 CN201220087119U CN202501931U CN 202501931 U CN202501931 U CN 202501931U CN 201220087119 CN201220087119 CN 201220087119 CN 201220087119 U CN201220087119 U CN 201220087119U CN 202501931 U CN202501931 U CN 202501931U
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- triode
- temperature
- transistor
- thermometer
- capacitor
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- Expired - Fee Related
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Abstract
The utility model discloses a temperature alarm used for a rice seedling bed, comprising an electric hotspot thermometer, a change-over switch, a loudspeaker, a battery, a first transistor, a second transistor, a first capacitor, a second capacitor and a resistor. The circuit of the temperature alarm disclosed by the utility model is a complementary oscillator circuit formed by the first transistor, the second transistor, the first capacitor, the second capacitor, the resistor and the battery; when the temperature reaches to the first high temperature end of the electric hotspot thermometer and the change-over switch is switched to the first high temperature end of the electric hotspot thermometer at the same time, the power supply anode supplies power to the base of the first transistor; the first transistor is conducted; the loudspeaker gives a sound alarm; when the temperature reaches to the second high temperature end of the electric hotspot thermometer, the power supply anode supplies power to the base of the first transistor; the first transistor is conducted; and the loudspeaker gives a sound alarm. The temperature alarm disclosed by the utility model can give a sound alarm when the temperature in a seedling shed is higher than 27 DEG.C (or 26 DEG.C) and remind peasants to ventilate and raise seedlings timely, so that the cultivated seedlings are guaranteed to be big and strong effectively.
Description
Technical field
The utility model relates to a kind of temperature alarm, relates in particular to a kind of rice seedling bed temperature alarm that is used for.
Background technology
The rice seedling bed majority of north China is stamped plastic greenhouse at the big bed of doing on the bed on the ground.After seed rice germinateed, the temperature in seedbed can not be above 27 ℃; Rice shoot length is during to three leaves, one pin, and nursery bed temperature can not be above 26 ℃.When being warm, when temperature of shed is high, should the Polypropylence Sheet of seedling culture shed being opened a bit, ventilate in good time and practice seedling, will not influence the growth of rice shoot if control temperature well.
Summary of the invention
The purpose of the utility model provides a kind of rice seedling bed temperature alarm that is used for regard to being in order to address the above problem.
The utility model is realized above-mentioned purpose through following technical scheme:
The utility model comprises electric heating point thermometer, switch, loudspeaker, battery, first triode, second triode, first electric capacity, second electric capacity and resistance; The anodal of said battery is connected with first end of the emitter of said second triode, first end of said first electric capacity, said electric capacity and the zero degree end of said electric heating point thermometer simultaneously; The negative pole of said battery is connected with first end of said loudspeaker and the emitter of said first triode simultaneously; First temperature end of said electric heating point thermometer is connected with first end of said switch; Second temperature end of said electric heating point thermometer is connected with second end of said switch; The movable end of said switch is connected with the base stage of said first triode; The collector of said first triode is connected with second end of said first electric capacity and the base stage of said second triode simultaneously; Second end of said resistance is connected with first end of said second electric capacity, and second end of said second electric capacity is connected with the collector of said second triode and second end of said loudspeaker simultaneously.
Particularly, first temperature end of said electric heating point thermometer is 26 ℃ of links, and second temperature end of said electric heating point thermometer is 27 ℃ of links; Said first triode is a NPN type triode, and said second triode is the positive-negative-positive triode.
The beneficial effect of the utility model is:
The utility model can be when the seedling temperature of shed surpasses 27 ℃ (or 26 ℃), warnings of sounding, the prompting peasant household experienced seedling that in time ventilates.Guaranteed that effectively the rice shoot that cultivates is not only thick but also strong.
Description of drawings
Accompanying drawing is the circuit structure schematic diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further:
Shown in accompanying drawing: the utility model comprises electric heating point thermometer Q, switch S, loudspeaker BL, battery GB, the first triode VT1, the second triode VT2, first capacitor C 1, second capacitor C 2 and the resistance R; The anodal of battery GB is connected with the emitter of the second triode VT2, first end of first capacitor C 1, first end of capacitor C 1 and the zero degree end of electric heating point thermometer Q simultaneously; The negative pole of battery GB is connected with first end of loudspeaker BL and the emitter of the first triode VT1 simultaneously; First temperature end of electric heating point thermometer Q is connected with first end of switch S; Second temperature end of electric heating point thermometer Q is connected with second end of switch S; The movable end of switch S is connected with the base stage of the first triode VT1; The collector of the first triode VT1 is connected with second end of first capacitor C 1 and the base stage of the second triode VT3 simultaneously; Second end of resistance R is connected with first end of second capacitor C 2, and second end of second capacitor C 2 is connected with the collector of the second triode VT2 and second end of loudspeaker BL simultaneously.
Shown in accompanying drawing: first temperature end of electric heating point thermometer Q is 26 ℃ of links, and second temperature end of electric heating point thermometer Q is 27 ℃ of links; The first triode VT1 is a NPN type triode, and the second triode VT2 is the positive-negative-positive triode.
Shown in accompanying drawing: the utility model circuit is formed complementary pierce circuit by the first triode VT1, the second triode VT2 and first capacitor C 1, second capacitor C 2, resistance R and battery BL; When temperature reached first temperature end of electric heating point thermometer Q, switch switched in first temperature end of electric heating point thermometer Q simultaneously, and positive source is to the base stage power supply of the first triode VT1; The first triode VT1 conducting; The loudspeaker BL warning of sounding, when temperature reached second temperature end of electric heating point thermometer Q, switch switched in second temperature end of electric heating point thermometer Q simultaneously; Positive source is to the base stage power supply of the first triode VT1; The first triode VT1 conducting, the loudspeaker BL warning of sounding, resistance R is selected metal film resistor or carbon film resistor for use.First capacitor C 1 or second capacitor C 2 are selected dacron terylene condenser or monolithic capacitor for use.The machine-operated VT1 of first peace selects 3DG6 or S9013 type silicon NPN triode for use; The second triode VT2 selects 3AX81 type germanium PNP triode for use.Loudspeaker BL selects 0.25W, 812 D.sp. for use.Electric heating point thermometer Q selects fixed electric heating point mercury thermometer for use.Switch S selects one pole dibit toggle switch for use.Battery GB uses No. 5 dry cells of two joints.
Claims (3)
1. one kind is used for rice seedling bed temperature alarm; It is characterized in that: comprise electric heating point thermometer, switch, loudspeaker, battery, first triode, second triode, first electric capacity, second electric capacity and resistance; The anodal of said battery is connected with first end of the emitter of said second triode, first end of said first electric capacity, said electric capacity and the zero degree end of said electric heating point thermometer simultaneously; The negative pole of said battery is connected with first end of said loudspeaker and the emitter of said first triode simultaneously; First temperature end of said electric heating point thermometer is connected with first end of said switch; Second temperature end of said electric heating point thermometer is connected with second end of said switch; The movable end of said switch is connected with the base stage of said first triode; The collector of said first triode is connected with second end of said first electric capacity and the base stage of said second triode simultaneously, and second end of said resistance is connected with first end of said second electric capacity, and second end of said second electric capacity is connected with the collector of said second triode and second end of said loudspeaker simultaneously.
2. according to claim 1ly be used for rice seedling bed temperature alarm, it is characterized in that: first temperature end of said electric heating point thermometer is 26 ℃ of links, and second temperature end of said electric heating point thermometer is 27 ℃ of links.
3. according to claim 1ly be used for rice seedling bed temperature alarm, it is characterized in that: said first triode is a NPN type triode, and said second triode is the positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220087119 CN202501931U (en) | 2012-03-09 | 2012-03-09 | Temperature alarm for rice seedling bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220087119 CN202501931U (en) | 2012-03-09 | 2012-03-09 | Temperature alarm for rice seedling bed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202501931U true CN202501931U (en) | 2012-10-24 |
Family
ID=47038542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220087119 Expired - Fee Related CN202501931U (en) | 2012-03-09 | 2012-03-09 | Temperature alarm for rice seedling bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202501931U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323132A (en) * | 2013-07-18 | 2013-09-25 | 黄月华 | Agricultural vinyl house low-temperature warning device |
| CN105865519A (en) * | 2016-03-28 | 2016-08-17 | 刘湘静 | System for monitoring paddy rice seedling bed based on Internet of Things |
-
2012
- 2012-03-09 CN CN 201220087119 patent/CN202501931U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323132A (en) * | 2013-07-18 | 2013-09-25 | 黄月华 | Agricultural vinyl house low-temperature warning device |
| CN105865519A (en) * | 2016-03-28 | 2016-08-17 | 刘湘静 | System for monitoring paddy rice seedling bed based on Internet of Things |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121024 Termination date: 20130309 |