CN204964624U - Thermistor detection device that entries - Google Patents
Thermistor detection device that entries Download PDFInfo
- Publication number
- CN204964624U CN204964624U CN201520716357.XU CN201520716357U CN204964624U CN 204964624 U CN204964624 U CN 204964624U CN 201520716357 U CN201520716357 U CN 201520716357U CN 204964624 U CN204964624 U CN 204964624U
- Authority
- CN
- China
- Prior art keywords
- thermistor
- fixed resistance
- voltage comparator
- airtight chamber
- unit
- 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.)
- Active
Links
Abstract
The utility model discloses a thermistor detection device that entries, including the casing, one way check valve device and detection circuitry, detection circuitry is including the fixed resistance A, fixed resistance B, thermistor A, thermistor B, zener diode and the voltage comparater that constitute bridge circuit, the casing includes non - closed chamber and closed chamber, and two thermistor set up respectively in non - closed chamber and closed chamber, and one way check valve sets up the lower extreme at non - closed chamber. The utility model discloses the emergence that detects the condition of entrying that can be very accurate, rapid to circuit structure is simple, and it is convenient to realize, the cost is lower, and the reliability is very high, and the application very extensively.
Description
Technical field
The utility model relates to a kind of thermistor and enters water pick-up unit.
Background technology
Enter water pick-up unit and be widely used in all kinds of rescue life-saving equipment, traditional water pick-up unit that enters passes through water-soluble material, or utilize buoyancy of water to detect, the accuracy of detection of these traditional pick-up units is not high enough, be easy to the situation that erroneous judgement occurs, and reaction velocity is comparatively slow, easily misses the opportunity to persons falling in water lifesaving.
Because water and air all exist a great difference in nature many, such as electric conductivity, thermal conductivity, buoyancy, density, pressure, dissolubility etc., there is multiple method can realize detecting into water according to the difference of these character, wherein according to the difference of thermal conductivity, thermistor can be utilized to carry out whether water-immersed detection, concrete mode is: apply certain electric current to thermistor and make it be in febrile state, utilize another to be in the temperature of the thermosensitive resistance measurement current environment of non-febrile state simultaneously, due to the difference of air and water heat conductivility, be in the thermistor under febrile state, its in atmosphere from water time resistance be different, thus cause the voltage at its two ends different, under utilizing fixed environment temperature, thermistor both end voltage value under febrile state and the corresponding relation of residing medium, whether water-immersed judgement can be carried out.This kind of technological approaches needs for specific environment test mass data and sets up corresponding database, and implement comparatively numerous and diverse, it is difficult to the impact that consideration air humidity, wind speed, air pressure etc. cause simultaneously, so limit its range of application.
In Chinese invention patent instructions CN201010005312.3, disclose a kind of launching detection sensor, this detecting sensor is installed under water with on equipment, has Stainless Steel Shell and contact pin; Contact pin is uniformly distributed in Stainless Steel Shell, and it is external that stainless steel case is exposed in a termination of contact pin, and the other end of contact pin is connected with wire.The present invention can meet under severe sea condition equipment enter water after outgoing signal, prove that equipment enters water, every program receive signal laggard enter duty.Although this device can play the effect detected into water, reaction velocity is sensitive not, and a large amount of have employed metal material, such that the volume of device is large, weight large, is unfavorable for the widespread use of device.
Utility model content
The technical problems to be solved in the utility model is for entering water pick-up unit in prior art sensitive not, accuracy of detection is not high, and the defect that pick-up unit volume is larger, provide a kind of device volume little, and the thermistor that can carry out accurately, rapidly detecting into water enter water pick-up unit.
The utility model solves the technical scheme that its technical matters adopts:
A kind of thermistor enters water pick-up unit, comprises housing, one way valve arrangement and testing circuit;
Described testing circuit comprises composition fixed resistance A, the fixed resistance B of bridge circuit, thermistor A, thermistor B, voltage stabilizing diode and voltage comparator;
Described fixed resistance A and described fixed resistance B is in brachium pontis, and described thermistor A and described thermistor B is in lower brachium pontis, connects power supply between two fixed resistances, and two thermistors indirectly;
Be connected with described voltage comparator input end after described voltage stabilizing diode in the middle of brachium pontis residing for described fixed resistance A and described thermistor A, residing for described fixed resistance B and described thermistor B, the centre of brachium pontis is directly connected with another input end of described voltage comparator, and the output terminal of described voltage comparator is connected with the device for detecting change in voltage;
Described housing comprises non-airtight chamber and airtight chamber, and two thermistors are separately positioned in described non-airtight chamber and described airtight chamber, and described one-way cock is arranged on the lower end of described non-airtight chamber.
The NTC thermistor of negative temperature coefficient selected by thermistor, and described voltage stabilizing diode is arranged on the normal phase input end of described voltage comparator.
The NTC thermistor of positive temperature coefficient (PTC) selected by thermistor, and described voltage stabilizing diode is arranged on the negative-phase input of described voltage comparator.
This device is before entering water and detecting, and power supply is powered to bridge circuit and made thermistor be in febrile state.
Described fixed resistance A is identical with the resistance of described fixed resistance B, and described thermistor A is identical with the specification of described thermistor B.
The beneficial effect that the utility model produces is: the utility model provides a kind of thermistor to enter water pick-up unit, when being contacted with water by thermistor, electrology characteristic changes, the output voltage of voltage comparator is changed, the generation into regimen condition can be detected very accurately, rapidly; Further, the circuit structure of this device is simple, and it is convenient to realize, and cost is lower, and reliability is very high, is beneficial to very much the miniaturization of device, and application is very extensive.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the circuit theory diagrams that the thermistor of the utility model embodiment enters the testing circuit of water pick-up unit;
Fig. 2 is the structural representation that the thermistor of the utility model embodiment enters water pick-up unit;
1-housing in figure, the non-airtight chamber of 101-, 102-airtight chamber, 2-one way valve arrangement, 3-testing circuit, 301-fixed resistance A, 302-fixed resistance B, 303-thermistor A, 304-thermistor B, 305-voltage stabilizing diode, 306-voltage comparator.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the thermistor of the utility model embodiment enters water pick-up unit, comprises housing 1, one way valve arrangement 2 and testing circuit 3.
As shown in Figure 2, the testing circuit 3 of the utility model embodiment, comprises fixed resistance A301, the fixed resistance B302 of composition bridge circuit, thermistor A303, thermistor B304, voltage stabilizing diode 305 and voltage comparator 306.Two fixed resistances are used for dividing potential drop benchmark device in bridge circuit.
Fixed resistance A301 and described fixed resistance B302 is in brachium pontis, and thermistor A303 and thermistor B304 is in lower brachium pontis, connects power supply between two fixed resistances, and two thermistors indirectly; Fixed resistance A301 is identical with the resistance of fixed resistance B302, and thermistor A303 is identical with the specification of thermistor B304.
Fixed resistance A301 is connected with voltage comparator 306 input end after voltage stabilizing diode 305 with in the middle of brachium pontis residing for thermistor A303, residing for fixed resistance B302 and thermistor B304, the centre of brachium pontis is directly connected with another input end of voltage comparator 306, and the output terminal of voltage comparator 306 is connected with the device for detecting change in voltage.The NTC thermistor of negative temperature coefficient selected by thermistor, and voltage stabilizing diode 305 is arranged on the normal phase input end of voltage comparator 306; The NTC thermistor of positive temperature coefficient (PTC) selected by thermistor, and voltage stabilizing diode 305 is arranged on the negative-phase input of voltage comparator 306.Voltage stabilizing diode is used for step-down and fluctuates the erroneous judgement caused to avoid slight voltage.
Housing 1 comprises non-airtight chamber 101 and airtight chamber 102, two thermistors and is separately positioned in non-airtight chamber 101 and airtight chamber 102, and one-way cock 2 is arranged on the lower end of non-airtight chamber 101.
In another embodiment of the present utility model, under the standby condition detecting water, in testing circuit, two fixed resistances and two thermistors form a kind of bridge architecture circuit jointly, under standby condition, power supply is powered to bridge circuit all the time, thermistor preliminary election is made to be in febrile state, because two fixed resistance value resistance specification performances are identical, two thermistor specification performances are also identical, so the voltage in the middle of bridge circuit two brachium pontis is equal, wherein fixed resistance value resistance A301 is connected with voltage comparator 306 normal phase input end after a voltage stabilizing diode 305 with in the middle of brachium pontis residing for thermistor A301, and be directly connected with voltage comparator 306 inverting input in the middle of brachium pontis residing for fixed resistance value resistance B302 and thermistor B304, due to the hypotensive effect of voltage stabilizing diode 305, voltage comparator normal phase input end voltage is lower than anti-phase input terminal voltage all the time, therefore voltage comparator 306 output terminal is low level, when carrying out detecting into water, only thermistor A301 is immersed in the water, because the thermal conductivity of water is significantly greater than air, temperature residing for thermistor A303 is caused to reduce, thus its resistance of thermistor A303 of negative temperature coefficient increases, so the voltage of brachium pontis intermediate point residing for fixed resistance value resistance A301 and thermistor A303 increases, by choosing the voltage stabilizing diode 305 of suitable parameters, can ensure after voltage stabilizing diode 305, the voltage of voltage comparator 306 normal phase input end exceedes anti-phase input terminal voltage, now voltage comparator output terminal becomes high level, reach and utilize thermistor to carry out the object detected into water.
In the utility model embodiment, the composition of apparatus structure comprises housing 1, one way valve arrangement 2, thermistor A303 and thermistor B304 and forms, two thermistors share a housing and can ensure in the setup time of thermistor under pre-febrile state, residing environment is consistent, thus unit for electrical property parameters is consistent; When housing 1 is immersed in the water, ensure to only have thermistor A303 to be immersed in the water by one way valve arrangement 2, thus realize utilizing the equipped equipment of diversity judgement thermistor apparatus structure of water and air conduction rate performance whether to be immersed in the water.
Due under standby condition time, every environment facies residing for two thermistors are same, what the utility model proposed utilizes thermistor to carry out the technology detected into water, the impact that the environment such as air humidity, wind speed, air pressure cause can be avoided, there is very strong practicality, especially in the water surface overhead that environment for use is changeable, this technical application is novel can be widely used in all kinds of rescue life-saving equipment.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to the utility model claims.
Claims (5)
1. thermistor enters a water pick-up unit, it is characterized in that, comprises housing (1), one way valve arrangement (2) and testing circuit (3);
Described testing circuit (3) comprises the fixed resistance A(301 of composition bridge circuit), fixed resistance B(302), thermistor A(303), thermistor B(304), voltage stabilizing diode (305) and voltage comparator (306);
Described fixed resistance A(301) and described fixed resistance B(302) be in brachium pontis, described thermistor A(303) and described thermistor B(304) be in lower brachium pontis, connect power supply between two fixed resistances, two thermistors are indirectly;
Described fixed resistance A(301) with described thermistor A(303) be connected with an input end of described voltage comparator (306) after described voltage stabilizing diode (305) in the middle of residing brachium pontis, described fixed resistance B(302) with described thermistor B(304) centre of residing brachium pontis is directly connected with another input end of described voltage comparator (306), the output terminal of described voltage comparator (306) is connected with the device for detecting change in voltage;
Described housing (1) comprises non-airtight chamber (101) and airtight chamber (102), two thermistors are separately positioned in described non-airtight chamber (101) and described airtight chamber (102), and described one-way cock (2) is arranged on the lower end of described non-airtight chamber (101).
2. thermistor according to claim 1 enters water pick-up unit, it is characterized in that, the NTC thermistor of negative temperature coefficient selected by thermistor, and described voltage stabilizing diode (305) is arranged on the normal phase input end of described voltage comparator (306).
3. thermistor according to claim 1 enters water pick-up unit, it is characterized in that, the NTC thermistor of positive temperature coefficient (PTC) selected by thermistor, and described voltage stabilizing diode (305) is arranged on the negative-phase input of described voltage comparator (306).
4. thermistor according to claim 1 enters water pick-up unit, it is characterized in that, this device is before entering water and detecting, and power supply is powered to bridge circuit and made thermistor be in febrile state.
5. thermistor according to claim 1 enters water pick-up unit, it is characterized in that, described fixed resistance A(301) with described fixed resistance B(302) resistance identical, described thermistor A(303) with described thermistor B(304) specification identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520716357.XU CN204964624U (en) | 2015-09-16 | 2015-09-16 | Thermistor detection device that entries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520716357.XU CN204964624U (en) | 2015-09-16 | 2015-09-16 | Thermistor detection device that entries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204964624U true CN204964624U (en) | 2016-01-13 |
Family
ID=55059680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520716357.XU Active CN204964624U (en) | 2015-09-16 | 2015-09-16 | Thermistor detection device that entries |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204964624U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116228A (en) * | 2015-09-16 | 2015-12-02 | 航宇救生装备有限公司 | Water-entry detection sensor for thermistors |
-
2015
- 2015-09-16 CN CN201520716357.XU patent/CN204964624U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116228A (en) * | 2015-09-16 | 2015-12-02 | 航宇救生装备有限公司 | Water-entry detection sensor for thermistors |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2013113171A (en) | MEASUREMENT OF TEMPERATURE OF A TECHNOLOGICAL FLUID | |
| CN202471632U (en) | Device for detecting closed-pore temperature and broken-diaphragm temperature of battery diaphragm | |
| CN201314846Y (en) | Temperature inspecting instrument | |
| CN108896613A (en) | Water logging detection device and method | |
| CN204964624U (en) | Thermistor detection device that entries | |
| CN103543288A (en) | S-shaped pitot tube based wind direction and velocity measurement device and method | |
| CN105116228A (en) | Water-entry detection sensor for thermistors | |
| CN104913860B (en) | Seawater detection method based on wireless telecommunications and device | |
| CN205373905U (en) | Temperature sensor | |
| CN207426063U (en) | Lithium battery temperature sensor detector | |
| CN204389129U (en) | Sealing cabin perforate automatic detection device | |
| CN104848958A (en) | Exhaust temperature sensor | |
| CN204188558U (en) | For the high precision multiple gases testing circuit of semiconductor gas sensor | |
| CN107677312B (en) | A kind of chip seawater conductivity-temperature-depth system | |
| CN106370268B (en) | Temperature sensing type liquid level switch utilizing self-heating effect of thermal resistor | |
| CN204944703U (en) | Based on the seawater sniffer of wireless telecommunications | |
| CN203365368U (en) | Semi-conductor gas sensor with temperature compensation function | |
| CN201398198Y (en) | XFP interface loopback test module | |
| CN206208342U (en) | A kind of temp sensing type liquid-level switch of the spontaneous fuel factor of utilization thermal resistance | |
| CN203337290U (en) | Thermistor automatic testing circuit | |
| CN108775934B (en) | Digital gas flow indirect metering method based on AMDF algorithm | |
| CN201909649U (en) | High-accuracy liquid level sensor | |
| CN112525292A (en) | Liquid level detection device and method | |
| CN105043595A (en) | Calibrator for transformer thermometer | |
| CN206847816U (en) | Temperature sensor line circuit structure with pwm pulse output detection function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |