CN100492427C - Linear temperature sensing detector based on thermocouple principle - Google Patents
Linear temperature sensing detector based on thermocouple principle Download PDFInfo
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- CN100492427C CN100492427C CNB2006100164952A CN200610016495A CN100492427C CN 100492427 C CN100492427 C CN 100492427C CN B2006100164952 A CNB2006100164952 A CN B2006100164952A CN 200610016495 A CN200610016495 A CN 200610016495A CN 100492427 C CN100492427 C CN 100492427C
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Abstract
The invention relates to a linear heat detector based on thermocouple principle. It includes detecting cable and voltage signal measuring device. The detecting cable at least includes two detecting conductors and semiconductor layer, fusible insulated layer and conductive layer. The linear sensor would cause dissolution to the fusible insulated layer and generate thermocouple effect to output fire alarming signal. The voltage of voltage signal measuring device is corresponding to the temperature of highest section of the detecting cable and it has high reliability. The invention adopts passive detecting method and is very safety.
Description
Technical field
The present invention relates to a kind of line-type heat detector, particularly relate to the high and line-type heat detector based on thermocouple principle simple in structure of a kind of reliability based on thermocouple principle.
Background technology
The thermojunction type line-type heat detector is a kind of broad-spectrum fire detector, is divided into two kinds of renewable type and beyond retrievables usually, mainly forms by surveying cable and being connected the voltage signal measurement mechanism of surveying cable one end.Fig. 1 surveys cable partial structurtes cut-open view in a kind of renewable type line-type heat detector of prior art.As shown in Figure 1, the detection cable in the renewable type line-type heat detector of this prior art by two parallel detecting conductors 3 that are provided with, be arranged on the NTC characteristic barrier layer 2 between the detecting conductor 3 and be coated on detecting conductor 3 and the sheath 1 of NTC characteristic barrier layer 2 outsides is formed.Wherein in two detecting conductors 3 at least one be to make by the thermocouple wire material, constitute thermopair thus.Because the voltage at detecting conductor 3 two ends is relevant with NTC characteristic barrier layer 2 with the thermocouple characteristic of surveying cable, promptly relevant with length, the temperature of length, environment temperature and the heated part of surveying cable, will limit the use length of surveying cable like this, and environment temperature also can impact the fire alarm threshold value of detector, thereby causes that the false alarm problem appears in detector.
Fig. 2 surveys cable lateral cross section structure cut-open view in a kind of irrecoverable linear temperature-sensitive detector of prior art.As shown in Figure 2, the detection cable in the irrecoverable linear temperature-sensitive detector of this prior art is made up of sheath 1, the parallel plastic layer 2 that is arranged on the detecting conductor more than two 3 of sheath 1 inside and is coated on the outside of detecting conductor 3 and has certain melting point or a fusing point.Wherein detecting conductor 3 adopts and makes such as the memory alloy wire elastomeric material.Cable is heated and when reaching uniform temperature, plastic layer 3 begins softening or melts when surveying, and the detecting conductor of being made by resilient material this moment 3 will rely on the elastic force of self and be in contact with one another, the phenomenon that promptly is short-circuited, thus reach the purpose of warning.But the advantage of this line-type heat detector is the equal short-circuit alarming when temperature of any reaches the setting alarm temperature arbitrarily on surveying cable, and the warning sensitivity and the length of being heated are irrelevant, and therefore the detection sensitivity to the fire that causes because of object of protection local overheating or external burning things which may cause a fire disaster is very high; Also can carry out fault alarm when in addition, a certain detecting conductor in surveying cable opens circuit.But the shortcoming of this line-type heat detector is it has the short circuit and fire hazard warning function, and does not have the short trouble warning function, therefore can't distinguish short-circuit fault alarm and short circuit fire alarm signal.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of influence of not surveyed length of cable and environment temperature, thereby reliability height, the security line-type heat detector based on thermocouple principle good and simple in structure.
In order to achieve the above object, the line-type heat detector based on thermocouple principle provided by the invention comprises surveys cable and voltage signal measurement mechanism, wherein surveys cable and comprises at least two parallel detecting conductors that are provided with; Parallel semiconductor material layer and parallel being arranged between the detecting conductor that is arranged between the detecting conductor is used to separate the fused insulating layer of detecting conductor, and in the detecting conductor at least one be thermocouple wire, constitute thermopair with this; Described detection cable also comprises parallel being arranged between semiconductor material layer and the fused insulating layer, is used to separate the conductive layer of semiconductor material layer and fused insulating layer.
Described conductive layer is the conductive layer of interrupted conducting or the conductive layer of continuous conducting.
The length of conductive segment is greater than 0.05m on the conductive layer of described interrupted conducting, and the distance between the conductive segment is 0.1～10mm.
Described conductive layer is by at least a the making in tinsel, sheet metal, metallic foil, open column shape metallic sheath, conducting resinl or the electrically-conducting paint.
Line-type heat detector based on thermocouple principle provided by the invention is to add the last layer fused insulating layer between detecting conductor, and make wherein at least one detecting conductor adopt the thermocouple wire material to make, like this when environment temperature is elevated to certain value, fused insulating layer between the detecting conductor at temperature rising position will produce thawing, thereby only stay semiconductor material layer, thereby produce the thermopair effect at this position, the voltage signal measurement mechanism just can be according to detected magnitude of voltage output fire alarm signal.In addition, the magnitude of voltage that the voltage signal measurement mechanism detects only with survey cable on the temperature at maximum temperature position corresponding, therefore the false alarm that the influence of detector caused because of the length of surveying cable and residing environment temperature can not appear, so have very high reliability.In addition, line-type heat detector of the present invention adopts the passive detection mode, and promptly need not provides power supply to surveying cable, so can be used for hazardous locations such as inflammable and explosive, therefore compares safety.
Description of drawings
Fig. 1 surveys cable partial structurtes cut-open view in a kind of renewable type line-type heat detector of prior art.
Fig. 2 surveys cable lateral cross section structure cut-open view in a kind of irrecoverable linear temperature-sensitive detector of prior art.
Fig. 3 is provided by the invention based on surveying cable one embodiment lateral cross section structure cut-open view in the line-type heat detector of thermocouple principle.
Fig. 4 is provided by the invention based on surveying another embodiment vertical structure cut-open view of cable in the line-type heat detector of thermocouple principle.
Fig. 5 is provided by the invention based on surveying the another embodiment lateral cross section of cable structure cut-open view in the line-type heat detector of thermocouple principle.
Embodiment
Below in conjunction with the drawings and specific embodiments the line-type heat detector based on thermocouple principle provided by the invention is elaborated.Line-type heat detector based on thermocouple principle provided by the invention mainly comprises to be surveyed cable and is connected the voltage signal measurement mechanism of surveying cable one end.As shown in Figure 3, Figure 4, described detection cable comprises at least two parallel detecting conductors that are provided with 4,5 and parallel being arranged between the detecting conductor 4,5, is used to separate the semiconductor material layer 7 and the fused insulating layer 6 of detecting conductor 4,5.At least one is thermocouple wire in the detecting conductor 4,5, all the other are thermocouple wire, plain metal silk or elastic conductor, constitute thermopair thus, and can adopt Ultimum Ti, NiTi copper memorial alloy, iron-based memorial alloy, copper-based memory alloy and have other material of memory function etc.The design load of the martensite reverse transformation finishing temperature Af of memorial alloy is preferably in 20 ℃～140 ℃ scopes.In addition, parallel setting comprises parallel, coaxial and mutually twines and is provided with etc.When detecting conductor 4,5 during parallel or coaxial the setting, semiconductor material layer 7 and fused insulating layer 6 can be arranged between the detecting conductor 4,5 in parallel or coaxial mode.And when detecting conductor 4,5 adopts the mode of twining mutually to be provided with, can be earlier semiconductor material layer 7 and the fused insulating layer 6 coating form with routine be coated on the detecting conductor 4,5, and then detecting conductor 4,5 is twined mutually.Method for coating can adopt the outside layer of semiconductor of the coating earlier material layer 7 of a detecting conductor therein, and then coats one deck fused insulating layer 6, or coats one deck fused insulating layer 6 earlier, coats layer of semiconductor material layer 7 again.Certainly, also semiconductor material layer 7 can be coated on respectively on the different detecting conductors with fused insulating layer 6.In addition, semiconductor material layer 7 is had at least a the making in the material of characteristic of semiconductor by PTC, CRT, NTC, conductive rubber, conductivity ceramics etc., can certainly adopt other suitable material to make, and between the preferred 0.1-5 millimeter of its thickness.Fused insulating layer 6 is by at least a the making in the materials such as wax, naphthalene anthracene, stearic acid, rosalin, low density polyethylene, high density polyethylene, polypropylene, Polyvinylchloride, can certainly adopt other suitable material to make, and between the preferred 0.1-2 millimeter of its thickness, between preferred 40 ℃～180 ℃ of the temperature of fusion.
Both there be not fire not have under the normal condition of fault yet, the fused insulating layer of surveying in the cable 6 is excellent, it separates detecting conductor 4 with semiconductor material layer 7,5, at this moment, therefore do not have the thermopair effect between the detecting conductor 4,5, it is almost nil to be connected the voltage signal measurement mechanism of surveying cable one end detected voltage from two detecting conductors 4,5.And when breaking out of fire, detection cable on the line-type heat detector will rise because of the temperature of being heated, when temperature is elevated to the softening range of fused insulating layer 6, fused insulating layer 6 will produce softening or melt, at this moment, the detecting conductor of being made by resilient material 4,5 will squeeze out between the detecting conductor 4,5 that is positioned at the heated part and the fused insulating layer 6 that has melted under self elastic force effect.But because the detecting conductor 4 at this position, still there is semiconductor material layer 7 between 5, therefore will produce the thermopair effect at this position, at this moment the voltage of surveying cable one end will change, and the voltage signal measurement mechanism is then according to detected magnitude of voltage or voltage variety (rate) output fire alarm signal.
Fig. 5 is provided by the invention based on surveying the another embodiment lateral cross section of cable structure cut-open view in the line-type heat detector of thermocouple principle.As shown in Figure 5, in the present embodiment, the line-type heat detector based on thermocouple principle provided by the invention comprises to be surveyed cable and is connected the voltage signal measurement mechanism of surveying cable one end.Wherein survey cable and comprise at least two parallel detecting conductors 13,14 that are provided with; Parallel being arranged between the detecting conductor 13,14 is used to separate the semiconductor material layer 15 and the fused insulating layer 17 of detecting conductor 13,14; And parallel being arranged between semiconductor material layer 15 and the fused insulating layer 17, be used to separate the conductive layer 16 of semiconductor material layer 15 and fused insulating layer 17.Owing to be provided with conductive layer 16 between semiconductor material layer 15 and the fused insulating layer 17, therefore can improve the reliability of conductor material and semiconductor material, thereby fire alarm signal more accurately can be provided.Conductive layer 16 is by at least a the making in the materials such as tinsel, nonmetal wire, sheet metal, metallic foil, open column shape metallic sheath, conducting resinl or electrically-conducting paint.In addition, conductive layer 16 can be interrupted also can be continuous, that is, intermittently conducting of conductive layer 16, also conducting continuously.When adopting the conductive layer 16 of the interrupted conductings of material preparation such as tinsel, nonmetal wire, sheet metal, metallic foil, open column shape metallic sheath, available these materials make the conductive layer 16 of interrupted conducting in advance, also can be earlier the conductive layer 16 of continuous conducting be set, and then be made into the state of interrupted conducting with physics such as machine cuts or chemical method.And when adopting conducting resinl or electrically-conducting paint to prepare the conductive layer 16 of interrupted conducting, can adopt intermittently and smear, spray or mode such as immersion directly forms the conductive strips/layer of an interrupted conducting along its length direction in the outside of semiconductor material layer 15 or fused insulating layer 17, also can set along conducting resinl or the electrically-conducting paint band/layer of its length direction in the outside of semiconductor material layer 15 or fused insulating layer 17 earlier, and then be made into the state of interrupted conducting with physics such as machine cuts or chemical method continuous conducting.In addition, the length of conductive segment is preferably greater than 0.05m, the distance between the conductive segment, promptly non-conductive section the preferred 0.1～10mm of length on the conductive layer 16 of interrupted conducting.In addition, as mentioned above, detecting conductor 13,14 can adopt parallel, coaxial or mutual canoe setting.When detecting conductor 13,14 adopts parallel or coaxial manner when being provided with, semiconductor material layer 15 and fused insulating layer 17 will walk abreast and be arranged between the detecting conductor 13,14, and conductive layer 16 is then parallel to be arranged between semiconductor material layer 15 and the fused insulating layer 17.And when detecting conductor 13,14 adopts mutual canoe to be provided with, semiconductor material layer 15, conductive layer 16 and fused insulating layer 17 can be coated on the detecting conductor, also can be coated on the different detecting conductors respectively, for example, can on a detecting conductor, coat semiconductor material layer 15 and conductive layer 16, and on all the other detecting conductors, coat fused insulating layer 17, or on a detecting conductor, coat semiconductor material layer 15, and on all the other detecting conductors coated with conductive layer 16 and fused insulating layer 17.
In addition, can be at the sheath that can play protection and insulating effect based on the detection cable outer setting in the line-type heat detector of thermocouple principle provided by the invention to detecting conductor, semiconductor material layer, fused insulating layer and conductive layer.In addition, also can connect the terminal resistance that resistance is 1K Ω～100M Ω, be used to monitor open circuit fault at an end of surveying cable.
Described thermocouple wire can adopt constantan (copper nickel), nisiloy, tungsten, chemical pure iron, examine a kind of in the metal materials such as copper, molybdenum, chemical fine copper, nickel chromium triangle, nickel, platinum, silver, also can adopt nonmetallic materials or semiconductor materials such as N type bismuth telluride, P type bismuth telluride such as graphite, silit, boron, chromium oxide.In addition, the line-type heat detector based on thermocouple principle provided by the invention can be a beyond retrievable, also can be renewable type.
Claims (4)
1, a kind of line-type heat detector based on thermocouple principle comprises and surveys cable and voltage signal measurement mechanism, wherein surveys cable and comprises at least two parallel detecting conductors (4,5) that are provided with; Parallel semiconductor material layer and parallel being arranged between the detecting conductor (4,5) that is arranged between the detecting conductor (4,5), be used to separate the fused insulating layer of detecting conductor (4,5), and detecting conductor (4,5) at least one is thermocouple wire in, constitutes thermopair with this; It is characterized in that: described detection cable also comprises parallel being arranged between semiconductor material layer and the fused insulating layer, is used to separate the conductive layer (16) of semiconductor material layer and fused insulating layer.
2, the line-type heat detector based on thermocouple principle according to claim 1 is characterized in that: described conductive layer (16) is the conductive layer of the conductive layer of interrupted conducting or continuous conducting.
3, the line-type heat detector based on thermocouple principle according to claim 2 is characterized in that: the conductive layer of described interrupted conducting (16) is gone up the length of conductive segment greater than 0.05m, and the distance between the conductive segment is 0.1～10mm.
4, the line-type heat detector based on thermocouple principle according to claim 1 is characterized in that: described conductive layer (16) is by at least a the making in tinsel, sheet metal, metallic foil, open column shape metallic sheath, conducting resinl or the electrically-conducting paint.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100164952A CN100492427C (en) | 2006-11-02 | 2006-11-02 | Linear temperature sensing detector based on thermocouple principle |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100164952A CN100492427C (en) | 2006-11-02 | 2006-11-02 | Linear temperature sensing detector based on thermocouple principle |
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| CN1949284A CN1949284A (en) | 2007-04-18 |
| CN100492427C true CN100492427C (en) | 2009-05-27 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101656010B (en) * | 2007-07-23 | 2011-01-12 | 首安工业消防有限公司 | Linear temperature sensing fire detector with electronic switch assembly and alarming method thereof |
| FR2999284B1 (en) * | 2012-12-12 | 2015-12-25 | Snecma | FIRE AND OVERHEAT DETECTOR COMPRISING A THERMOCOUPLE |
| CN103698035B (en) * | 2013-12-05 | 2015-12-02 | 宁波工程学院 | The preparation technology of the single arm structure of thermoelectric semiconductor temperature sensing sheet |
| CN110926637B (en) * | 2019-11-07 | 2021-06-11 | 无锡英特派金属制品有限公司 | Preparation method of industrial anti-attenuation platinum and platinum-rhodium thermocouple |
| CN113984234A (en) * | 2021-10-28 | 2022-01-28 | 中国电信股份有限公司 | Alarm device and twisted thermocouple wire sensor |
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Denomination of invention: Linear temp. sensing detector based on thermocouple principle Effective date of registration: 20121010 Granted publication date: 20090527 Pledgee: Bank of America Ltd. Shanghai branch Pledgor: Sureland Industrial Fire Safety Ltd. Registration number: 2012990000591 |
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