CN2565003Y

CN2565003Y - Composite line-type temp sensor

Info

Publication number: CN2565003Y
Application number: CN 02254341
Authority: CN
Inventors: 刘智绵
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-05-24
Filing date: 2002-09-13
Publication date: 2003-08-06
Anticipated expiration: 2012-09-13

Abstract

The utility model relates to a composite line type temperature sensor, which is provided with at least four conductors, wherein, two conductors respectively coat a temperature sensitive insulation layer, and then are mutually hinged; the other two conductors respectively coat a common insulation layer, and then are mutually hinged; then, two pairs of hinged conducting wires are coated with sheaths. When the utility model is used, every two terminals of the four conducting wires in an electrical cable of the temperature sensor are short-circuited and then are sealed through thermoplastic sleeves. The starting ends of the four conducting wires are respectively connected to four input terminals of a microprocessor. The product, which has the function of both responding to both a temperature rise of slow change and a fast temperature rise, is mainly used for the early detection of a fire accident and the abnormal temperature monitoring of various equipment or articles caused by overheating, sparks, self-ignition, etc. in a harsh environment in the industrial field.

Description

The composite linear temperature sensor

Technical field: the utility model relates to the abnormal temperature monitoring that reason such as overheated, the spark, spontaneous combustion of a kind of early detection that is mainly used in fire and industrial circle various device or article under rugged surroundings causes.

Background technology: in the existing in the market similar line-type heat detector, switching value still is that the renewable type type all exists two problems: first because support circuit all belongs to the discrete component formation, has failure rate and rate of false alarm problem of higher on engineering; Second all belongs to constant temperature character.Promptly main response is the temperature variation of rising slowly, and can not respond the temperature variation of quick generation, does not promptly have the differential temperature response performance.

Summary of the invention: the purpose of this utility model is the deficiency at above-mentioned technology, and a kind of have differential temperature and constant temperature response performance are provided, and analog quantity is reusable, and operating temperature can be set the highly sensitive composite linear temperature sensor of adjustment.For achieving the above object, the utility model adopts following technical proposals: a kind of composite linear temperature sensor, it has at least four conductors (1), (2), (3), (4), and it is stranded mutually then that wherein conductor (1), (2) or (3), (4) coat temperature-sensitive insulation course (5) respectively; Conductor (3), (4) or (1), (2) coat common insulation course (6) respectively, and are stranded mutually then, will coat sheath (7) on the lead behind two strands again, and (1) in four conductors of this sensing cable terminal (9), (2) are short circuit mutually; (3), (4) mutual short circuit, with the sealing shroud sealing, receive respectively in the micro treatmenting device (10) four conductors (1) of cable head, (2), (3), (4) then.Hardware components is mainly by the power supply polar switching control module of sensor in the micro treatmenting device; Sensitivity is provided with the unit; Buffering and noise filtering unit; The single-chip microcomputer operation processing unit; Gas well, fault are normally moved the indication driver element; Circuit such as gas well fault output relay driver element are formed.The power supply of detector can be provided by the common alarm controller of various standards, also can be separately by the direct current supply of 8-30 volt.Have a temperature monitoring system of one's own.The output of detector has two kinds of modes: a kind of gas well or fault-signal of being exported by the passive contact of relay can be connected with the alarm controller of any line system.Another kind of exportable 0-5 lies prostrate temperature variant analog signals.Can convert thereof into corresponding temperature digital by interlock circuit shows.

The utility model has the advantages that: the function (being the differential temperature response function) that 1, has response rapid warm raising speed; 2, the lay configuration of Cai Yonging has the characteristics of anti-strong electromagnetic; 3, its operating temperature range can be from 35-160 ℃ of continuous adjustable the setting; 4,,, the polar switching feature temperature signal is extracted the influence that produces because can eliminating the temperature-sensing element (device) capacitive reactances with the supporting special circuit of sensor cable; 5, circuit part mainly adopts the software and hardware combining microprocessor technology, reduces hardware circuit, improves sensitivity, the reliability and stability of system greatly.6, the specific combination of the material of temperature sensor cable and structure and supporting special circuit has the variation of ambient temperature compensate function, can improve the sensitivity and the environment for use temperature range of sensor so greatly.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is an A-A synoptic diagram among Fig. 1.

Fig. 3 is a formation connection diagram of the present utility model.

Fig. 4 is the utility model circuit working theory diagram.

Specific embodiment:

With reference to Fig. 1,2,3, a kind of composite linear temperature sensor, it has at least four

conductors

1,2,3,4, and it is stranded mutually then that wherein

conductor

1,2 or 3,4 coats temperature-sensitive insulation course 5 respectively;

Conductor

3,4 or 1,2 coats common insulation course 6 respectively, and is stranded mutually then, will coat

sheath

7,1,2 mutual short circuits in four conductors of this sensing cable terminal 9 on the lead behind two strands again; 3,4 mutual short circuits, with the sealing shroud sealing, four

conductors

1,2,3,4 of cable head are received respectively in the micro treatmenting device 10 then.But the outside of described plastic sheath 7 is braided metal oversheath 8 also.

With reference to Fig. 4, hardware components is mainly by the power supply polar switching control module of sensor in the micro treatmenting device; Sensitivity is provided with the unit; Buffering and noise filtering unit; The single-chip microcomputer operation processing unit; Gas well, fault are normally moved the indication driver element; Gas well fault output relay driver element waits circuit to form.Each cell descriptions of circuit: 1, resistor network R: the build-out resistor of temperature sensor, will deliver to filter unit after the temperature signal extraction; 2, filter unit: to delivering to the AD converting unit after the temperature signal filtering; 3, AD converting unit: handle to delivering to single-chip microcomputer after the temperature signal digitizing; 4, single machine unit: handle digital temperature signal, controlling output circuit output fire alarm, fault, normal signal and analog signals, the control polarity control circuit applies the Information Monitoring of opposed polarity to temperature sensor; 5: output control unit: receive the Single-chip Controlling signal, drive fire alarm, fault and analog signals output; 6, Polarity Control unit: receive the Single-chip Controlling signal, drive polarity switching; 7, polarization converting unit: under the driving of polarity control circuit, realize applying the Information Monitoring of opposed polarity to temperature sensor; 8, fire alarm, fault, analog value unit: the indication of temperature sensor duty.The power supply of detector can be provided by the common alarm controller of various standards, also can be separately by the direct current supply of 8-30 volt.Form a temperature monitoring system.The output of detector has two kinds of modes: a kind of gas well or fault-signal of being exported by the passive contact of relay can be connected with the alarm controller of any line system.Another kind of exportable 0-5 lies prostrate temperature variant analog signals.Can convert thereof into corresponding temperature digital by interlock circuit shows.The principle of work of composite linear temperature sensor: the extraction of temperature sensing receiver temperature signal is realized by resistor network R and sensor polarity switching, resistor network R is the impedance matching resistance of temperature sensor, polarity switching is that temperature sensor alternately applies the different voltage of polarity, temperature signal is extracted the influence that produces to eliminate the temperature sensor capacitive reactances.Temperature is extracted the variation that circuit is converted into the temperature sensor impedance variation that is caused by temperature variation the filtering circuit input terminal voltage, wave circuit filtering noise after filtration, A/D convertor circuit the analog quantity information digitizing after, send into single-chip microcomputer (or microprocessor) and carry out data operation, analysis and judgement, single-chip microcomputer (or microprocessor) to output control circuit, is realized the warning of fire and breakdown detector through certain algorithm process output temperature sensor status information.Change sensitivity is provided with the setting of circuit can set different fire alarm sensitivity levels.(environment temperature is in the normal variation scope under the normal monitoring state, as :-20 ℃--+35 ℃) all there is certain atomic little electric current flowing in four leads of detector and the micro treatmenting device, make green LED glittering, be in the normal monitoring state with indication detector by some cycles.Protect area in accordance with regulations when temperature sensing cable and install, a certain interval has abnormal temperature to raise in the protected location, place, and then the impedance phase of the temperature-sensitive insulating material of temperature sensing cable should be pressed the certain ratio variation thereupon.When temperature is elevated to predefined alarming value, or temperature rise rate reaches predetermined value within a certain period of time, then micro treatmenting device is judged relatively by software, takes place if be confirmed to be real abnormal temperature value or initial fire disaster sign, then instructs hardware circuit to send corresponding early warning signal.If temperature continuation this moment raises and temperature rise rate also reaches corresponding numerical value, then detector after judging that affirmation is errorless, then drives the gas well actuating of relay and sends the gas well signal to alarm controller again.The gas well red led is lighted, and can instruct corresponding extinguishing device to move simultaneously.When gas well is handled China, when the scene returned to the Normal Environmental Temperature scope again, the impedance of temperature sensing cable also returned to the normal monitoring value, and detector returns the normal monitoring state again automatically, is not damaged by the high temperature more than 300 ℃ but condition is a sensing cable.Arbitrary broken string or top, terminal open circuit in four leads of sensing cable, components and parts damage in the micro treatmenting device, or any two lead suddenly-applied short circuits of sensing cable, and detector all will send failure alarm signal automatically.

Claims

1, a kind of composite linear temperature sensor is characterized in that: it has at least four conductors (1), (2), (3), (4), and it is stranded mutually then that wherein conductor (1), (2) or (3), (4) coat temperature-sensitive insulation course (5) respectively; Conductor (3), (4) or (1), (2) coat common insulation course (6) respectively, and are stranded mutually then, will coat sheath (7) on the lead behind two strands again, and (1) in four conductors of this sensing cable terminal (9), (2) are short circuit mutually; (3), (4) mutual short circuit, with the sealing shroud sealing, receive respectively in the micro treatmenting device (10) four conductors (1) of cable head, (2), (3), (4) then.

2, composite linear temperature sensor according to claim 1 is characterized in that: at plastic sheath (7) but outside braided metal oversheath (8) also.