CN2718740Y - Electric resistance cable type temperature measuring alarming cable - Google Patents
Electric resistance cable type temperature measuring alarming cable Download PDFInfo
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- CN2718740Y CN2718740Y CN 200420062979 CN200420062979U CN2718740Y CN 2718740 Y CN2718740 Y CN 2718740Y CN 200420062979 CN200420062979 CN 200420062979 CN 200420062979 U CN200420062979 U CN 200420062979U CN 2718740 Y CN2718740 Y CN 2718740Y
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- cable
- temperature
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Abstract
The utility model relates to an electric resistance cable type temperature measuring alarming cable, which belongs to the technical field of cable. The cable adopts the copper alloy wire with small electrical resistivity and resistance temperature coefficient as an inner conductor. The inner conductor is provided with a high-temperature resistant NTC shaped metal oxide semi-conducting layer, and the semi-conducting layer is provided with a copper alloy pipe with small electrical resistivity and resistance temperature coefficient. The copper alloy pipe is provided with a perfluoroethylene insulating barrier, a copper wire braiding shielding layer, and a fluoroplastic oversheath in sequence. The utility model has the advantages of simple and reasonable structure, easy manufacture, convenient use, broad application, wide alarming range of temperature, easy adjustment of the alarming point, exact alarming, and good performance of repeating utilization. Except for using as the fire alarming, the cable also can be used in the place requiring to measure temperature, so the cable not only is made to be used as the detector for fire alarming system, but also can be used as the temperature sensors.
Description
Technical field
The utility model relates to fire detecting system and is used for the structure of heat-sensitive cable of detecting temperature situation of change, belongs to the cable technology field.
Background technology
Fire is that the personnel that cause injure one of great disaster with property loss, the extensive use of automatic technology, and the increase of various electric installations has more increased the danger of breaking out of fire.According to relevant report statistics, the kind fire reaches 5300 times/day the most for a long time in the U.S. at present, and Britain is 800 times/day, and China is 500 times/day.The loss that fire brings to the mankind is startling.
For this reason, the various places, various countries have all been formulated strict day by day fire codes in succession, and are also more strict to the fire-fighting requirement of architectural engineering.Current naval vessel, production platform, petroleum chemical enterprise, power plant power station, automatic control center building, hotel, hypogee, tunnel underground etc. need the fire monitoring autoalarm, are beneficial to fire extinguishing, warning, illumination, communication etc.
China also quite payes attention to the fire safety and the fire-extinguishing and lifesaving of aspects such as building, the regulation that all designs relevant for fire prevention in the national at present various engineering design standards of having issued is as GBJ167 " Code for fire protection design of buildings ", GB50217 " Code for design of cables of electric works " or the like.
Be applicable to the fire detecting system of fire alarm, generally be divided into a type fire detecting system and cable linear fire detecting system.Point type fire detecting system mainly is by being arranged on point detector in the search coverage reaches warning to the perception of light, cigarette or temperature purpose, but it has not enough point: 1, fire alarm product and system price costliness, system complex, whole system construction, maintenance technology require high; 2, rate of false alarm height, particularly cigarette/optical flame detector because their poor sealing performance, so that often report by mistake because of dust or mosquito enter, show that through investigation and statistics the false alarm rate of smoke detector and system is higher, agnogenic alarm rate nearly 30%; 3, product quality and stability await further raising, the field effect transistor breakdown problem that particularly exists electrostatic effect to introduce; The product humidity resistance is low in addition, and is corresponding higher to the humidity requirement of environment.
The cable linear fire detecting system mainly is the situation of change of coming detecting temperature by heat-sensitive cable, the control alarm.Existing heat-sensitive cable is provided with plastics band and plastics oversheath jointly and forms by adding the temperature-sensitive insulation material layer respectively on two elastic wire conductors arranged side by side on insulating barrier.Under the normal monitoring state, two steel wires are state of insulation.In each heat-sensitive cable, there is an atomic little electric current to flow, when temperature (can be the surface temperature of " cable " surrounding air or its article that the contact) rising at any point (position) on the heat-sensitive cable circuit reaches its rated function temperature, its insulating material fusing, two steel wires contact with each other, this moment, the alarm circuit electric current increased suddenly, and alarm controller sends sound, light is reported to the police.Compare with point detector, it is simple in structure, and is lower to environmental requirement, but also there is deficiency in it: one, alarm temperature is restricted, generally can only be more than 68 ℃, and the highest alarm temperature can only be at 138 ℃; Two, can not recover automatically after the warning, but reuse is poor; Three, can not thermometric, only when rising to fixing point, temperature just responds, and can not continuous alarm; Four, because alarm temperature depends on the fusing point of insulation, so in case after installing, alarm point can not be transferred again.
The purpose of this utility model is that a kind of alarm temperature wide ranges will be provided, the electric resistance cable type thermometric alarm cable that reuse is good.
The purpose of this utility model is achieved through the following technical solutions, electric resistance cable type thermometric alarm cable, comprise conductor, insulating barrier and oversheath, it is characterized in that cable is provided with semi-conductive layer and screen, conductor is divided into inner wire and outer conductor, semi-conductive layer is set on the inner wire, and outer conductor is nested with on semi-conductive layer, sets gradually insulating barrier, screen and oversheath on outer conductor.Described inner wire is resistivity and the little copper alloy wire of temperature coefficient of resistance.Outer conductor is resistivity and the little copper alloy tube of temperature coefficient of resistance.Semi-conductive layer is a NTC type metal oxide layer.Metal oxide is MnO
2Or Mn
3O
4, Ti
2O
3, MnO
2, Mn
3O
4, Ti
2O
3Mixture.The working temperature of metal oxide layer is not less than 300 ℃.Described insulating barrier is a polytetrafluoroethylene.Screen is copper strips or copper wire braid.Oversheath is the fluoroplastics cover.
The utility model is simple and reasonable, manufactures easily, and easy to use, applicability is wide, the alarm temperature wide ranges, and alarm point is easily adjusted, and reports to the police accurately, and reuse is good.
On conductor design, consider the influence of conductor resistance to insulation resistance, consider that again the conductor resistance temperature coefficient is little, so select the copper alloy conductor that resistivity is little and temperature coefficient of resistance is little for use.If resistance and insulation resistance are more or less the same, and conductor generally is positive temperature coefficient and changes, and will influence the measurement to temperature like this.
The semi-conductive layer design is a key technology of the present utility model, material that it adopted and relevant size design all can directly have influence on the performance of product, on the one hand, require semiconductive resistance that obvious variation is arranged when variations in temperature, and reduce along with the rising of temperature, require it to change good reproducibility simultaneously, be elevated to when very high when temperature on the other hand, the requirement insulation resistance can not be too little, otherwise, temperature survey reflection is insensitive, so insulating barrier adopts the metal oxide of NTC effect, and when requiring 25 ℃ resistivity for being not less than 10
6Ω m, and require the B value between 2000～8000K.
Outer conductor in fact also is an electrode, so outer conductor must have the same performance with the inner wire electrode, also has function of shielding simultaneously, to prevent external interference to the interference of current signal and cause wrong report, so select for use and inner wire same metal or alloy material.
Owing to require cable can afford to stand the test of high temperature when this cable uses, so its insulating barrier must be high temperature resistant, otherwise, its recycling also becomes an empty verbiage, by the experience that the reference high temperature-resistant cable is made, employing can resistant to elevated temperatures polytetrafluoroethylene and fluoroplastics make the material of insulating barrier and oversheath respectively.Cable insulation adopts metal oxide materials, and its fusing point is higher, therefore can measure the temperature in the higher temperature scope, and cable can be surveyed the temperature more than 250 ℃, has expanded the field of employment of cable.
Because this cable is a kind of transducer when in fact using, therefore strict to its Electro Magnetic Compatibility, so, have good interference free performance in order to guarantee it, added one deck copper strips or copper wire woven shield.
Outer conductor is the metal or alloy sheath, be to draw by seamless metal or compo pipe to form, thereby moisture content do not have any approach and can enter cable inside, and be that the ideal of the bigger underground of moist gas such as subway, tunnel selects to use alarm cable.Because metallic sheath has formed a nature and best screen, has added one deck screen outside again, the anti-electromagnetic interference performance of cable is good, guarantees can safely and steadily run in various places, can not produce wrong report.
The utility model is actually a kind of sensor for measuring temperature, adopt NTC type metal oxide to make the function element of cable, cable has been possessed: one, can design alarm temperature arbitrarily, in the working temperature that cable allows, can change alarm temperature arbitrarily, the cable applicability is strengthened; But two reuses are strong, because the cable operation principle is not the fusing of insulating barrier, come work but change according to the resistance temperature of semi-conductive layer, so after warning work once, Maintenance free can be reused; Three, because NTC itself is a kind of temperature sensing material, so cable except can making fire alarm usefulness, need also to can be applicable to thermometric place, increases the range of application of cable, make cable not only can be used as detector for fire alarm system and use, also can be used as temperature sensor and use.For the recycling that guarantees that cable work can be real, employing polytetrafluoroethylene exotic material does insulating barrier and fluoroplastics are done oversheath.Its highest long-term work temperature of polytetrafluoroethylene is 260 ℃, and does not burn, and make cable have: one, cable has good flame retardancy, has strengthened the useful life of cable under fire hazard environment; Two, cable has good heat-resistant, has improved the working life of cable under long term high temperature and stable.
Description of drawings
Figure 1 shows that structural representation of the present utility model, among the figure: 1 inner wire, 2 semi-conductive layers, 3 outer conductors, 4 insulating barriers, 5 screens, 6 oversheaths.
Embodiment
Adopting resistivity and the little copper alloy wire of temperature coefficient of resistance is inner wire 1, and the NTC type metal oxide MnO that working temperature is not less than 300 ℃ is set in the conductor
2Be semi-conductive layer 2, it is outer conductor 3 that the little copper alloy tube of resistivity and temperature coefficient of resistance is set on semi-conductive layer 2, extrude teflon insulation layer 4 on the outer conductor 3, copper wire woven shield 5 is set on insulating barrier 4, extrudes the fluoroplastics oversheath 6 of high-temperature resistant anti-corrosive on the copper wire woven shield 5.
Claims (9)
1, a kind of electric resistance cable type thermometric alarm cable, comprise conductor, insulating barrier and oversheath, it is characterized in that cable is provided with semi-conductive layer and screen, conductor is divided into inner wire and outer conductor, semi-conductive layer is set on the inner wire, outer conductor is nested with on semi-conductive layer, sets gradually insulating barrier, screen and oversheath on outer conductor.
2, electric resistance cable type thermometric alarm cable according to claim 1 is characterized in that described inner wire is resistivity and the little copper alloy wire of temperature coefficient of resistance.
3, electric resistance cable type thermometric alarm cable according to claim 1 is characterized in that described outer conductor is resistivity and the little copper alloy tube of temperature coefficient of resistance.
4, electric resistance cable type thermometric alarm cable according to claim 1 is characterized in that described semi-conductive layer is a NTC type metal oxide layer.
5, according to claim 1 or 4 described electric resistance cable type thermometric alarm cables, it is characterized in that described metal oxide is MnO
2Or Mn
3O
4, Ti
2O
3, or MnO
2, Mn
3O
4, Ti
2O
3Mixture.
6, according to claim 4 or 5 described electric resistance cable type thermometric alarm cables, the working temperature that it is characterized in that described metal oxide layer is greater than 300 ℃.
7, electric resistance cable type thermometric alarm cable according to claim 1 is characterized in that described insulating barrier is a polytetrafluoroethylene.
8, electric resistance cable type thermometric alarm cable according to claim 1 is characterized in that described screen is copper strips or copper wire braid.
9, electric resistance cable type thermometric alarm cable according to claim 1 is characterized in that described oversheath is the fluoroplastics cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420062979 CN2718740Y (en) | 2004-07-22 | 2004-07-22 | Electric resistance cable type temperature measuring alarming cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420062979 CN2718740Y (en) | 2004-07-22 | 2004-07-22 | Electric resistance cable type temperature measuring alarming cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2718740Y true CN2718740Y (en) | 2005-08-17 |
Family
ID=34893506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420062979 Expired - Fee Related CN2718740Y (en) | 2004-07-22 | 2004-07-22 | Electric resistance cable type temperature measuring alarming cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2718740Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007036097A1 (en) * | 2005-09-29 | 2007-04-05 | Weishe Zhang | Switch volume linetype temp sensing fire detecting cable based on shape memory alloy wire |
| WO2007053991A1 (en) * | 2005-11-14 | 2007-05-18 | Gangjin Li | Analog linetype constant temp fire detecting cable |
| CN100416616C (en) * | 2005-11-14 | 2008-09-03 | 李刚进 | Fire detecting cable based on memory alloy wire and pressure-sensing conductive rubber and alarm method |
| CN100430967C (en) * | 2006-12-26 | 2008-11-05 | 首安工业消防有限公司 | Linear temperature sensing element equipped with fused insulating layer and pressure-sensitive rubber layer |
| CN100461225C (en) * | 2006-07-07 | 2009-02-11 | 首安工业消防有限公司 | Analog quantity linear temperature-sensing fire hazard exploration cable |
| CN101640080B (en) * | 2008-07-29 | 2011-08-31 | 上海长顺电梯电缆有限公司 | Cable for elevator encoder |
| CN102608173A (en) * | 2012-02-23 | 2012-07-25 | 广东白云学院 | Wide humidity environment-friendly humidity sensing device and control method thereof |
| CN102751008A (en) * | 2011-04-19 | 2012-10-24 | 大连沈特电缆有限公司 | Copper-clad aluminum core resistance thermometer cable |
| CN102975400A (en) * | 2012-12-10 | 2013-03-20 | 常州震驰电工材料有限公司 | Braided sleeve used under high temperature environment |
| CN103093867A (en) * | 2012-12-26 | 2013-05-08 | 四川九洲线缆有限责任公司 | Resistance stabilizing cable |
| CN105336416A (en) * | 2015-11-05 | 2016-02-17 | 广东爱晟电子科技有限公司 | Small-diameter ray-proof lead and small-volume temperature sensor |
-
2004
- 2004-07-22 CN CN 200420062979 patent/CN2718740Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007036097A1 (en) * | 2005-09-29 | 2007-04-05 | Weishe Zhang | Switch volume linetype temp sensing fire detecting cable based on shape memory alloy wire |
| WO2007053991A1 (en) * | 2005-11-14 | 2007-05-18 | Gangjin Li | Analog linetype constant temp fire detecting cable |
| CN100416616C (en) * | 2005-11-14 | 2008-09-03 | 李刚进 | Fire detecting cable based on memory alloy wire and pressure-sensing conductive rubber and alarm method |
| CN100461225C (en) * | 2006-07-07 | 2009-02-11 | 首安工业消防有限公司 | Analog quantity linear temperature-sensing fire hazard exploration cable |
| CN100430967C (en) * | 2006-12-26 | 2008-11-05 | 首安工业消防有限公司 | Linear temperature sensing element equipped with fused insulating layer and pressure-sensitive rubber layer |
| CN101640080B (en) * | 2008-07-29 | 2011-08-31 | 上海长顺电梯电缆有限公司 | Cable for elevator encoder |
| CN102751008A (en) * | 2011-04-19 | 2012-10-24 | 大连沈特电缆有限公司 | Copper-clad aluminum core resistance thermometer cable |
| CN102608173A (en) * | 2012-02-23 | 2012-07-25 | 广东白云学院 | Wide humidity environment-friendly humidity sensing device and control method thereof |
| CN102975400A (en) * | 2012-12-10 | 2013-03-20 | 常州震驰电工材料有限公司 | Braided sleeve used under high temperature environment |
| CN103093867A (en) * | 2012-12-26 | 2013-05-08 | 四川九洲线缆有限责任公司 | Resistance stabilizing cable |
| CN103093867B (en) * | 2012-12-26 | 2015-06-17 | 四川九洲线缆有限责任公司 | Resistance stabilizing cable |
| CN105336416A (en) * | 2015-11-05 | 2016-02-17 | 广东爱晟电子科技有限公司 | Small-diameter ray-proof lead and small-volume temperature sensor |
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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: 20050817 Termination date: 20090824 |