CN114993503B - Recoverable constant temperature type temperature sensing cable - Google Patents

Recoverable constant temperature type temperature sensing cable Download PDF

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Publication number
CN114993503B
CN114993503B CN202210924463.1A CN202210924463A CN114993503B CN 114993503 B CN114993503 B CN 114993503B CN 202210924463 A CN202210924463 A CN 202210924463A CN 114993503 B CN114993503 B CN 114993503B
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temperature
galvanized steel
sensing cable
recoverable
temperature sensing
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CN202210924463.1A
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CN114993503A (en
Inventor
高文彬
李磊
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Hebei Weitan Electronic Equipment Co ltd
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Hebei Weitan Electronic Equipment Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02Cleaning by the force of jets, e.g. blowing-out cavities
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02Means for indicating or recording specially adapted for thermometers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/14Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)

Abstract

The application discloses be applied to a recoverable constant temperature type temperature sensing cable in cable field, in this scheme, the first galvanized steel wire that has wrapped NTC negative resistance material and dacron single silk screen and the second galvanized steel wire of cladding semiconductor material cover strand together, the conflagration takes place in the external world, when the temperature rises, can cause NTC negative resistance material to melt and dip in dacron single silk screen, first galvanized steel wire and second galvanized steel wire realize the contact connection through semiconductor material cover and NTC negative resistance material this moment, the temperature sensing cable short circuit, detection device who is connected with the temperature sensing cable can detect the change of above-mentioned signal of telecommunication, and send the police dispatch newspaper, in time discover the conflagration, and when the phenomenon of high temperature appears in temperature in the temperature sensing cable part, the temperature between attached net and the oversheath rises, form the hot-air current from the oversheath to attached net, make the heat of collecting together with hot-blast diffusion, and also can go out the dust that accumulates on the elastic fiber in the twinkling of an eye that elastic fiber is blown away.

Description

Recoverable constant temperature type temperature sensing cable
Technical Field
The application relates to the field of cables, in particular to a recoverable constant-temperature sensing cable.
Background
The temperature sensing cable is internally provided with two elastic steel wires, a layer of temperature sensing and insulating material is wrapped outside each steel wire, the two steel wires are in an insulating state in a normal monitoring state, when the ambient temperature rises to a preset action temperature, the temperature sensing material is broken, the two steel wires generate short circuit, and an input module detects a short circuit signal and then generates an alarm. The temperature-sensing cable detector can be used in places such as power stations, substations, cable channels, tunnels, interlayers and conveyor belts, is stable and reliable, and is suitable for fire detection in severe environments.
The recoverable temperature sensing cable is also called as an analog quantity temperature sensing cable, the recoverable temperature sensing cable is composed of steel wires insulated by heat-sensitive materials, when the field temperature changes, the resistance between the steel wires changes, when the resistance change reaches a set alarm threshold value, a detector sends out a fire alarm signal, after the temperature is reduced, the resistance between the wires recovers to a normal value, and the performance is recovered, namely the recoverable temperature sensing cable.
The existing temperature sensing cables are mostly used in relatively severe environments, dirt such as muddy water and the like is easily generated on the surfaces of the temperature sensing cables in the environments, the dirt can influence the dissipation of heat generated when the temperature sensing cables work normally and can also influence the supervision of the temperature sensing cables on the environmental temperature monitoring, further the detection accuracy of the temperature sensing cables is influenced, the phenomenon of false alarm or failure of normal alarm is caused, and serious potential safety hazards are generated.
Disclosure of Invention
The utility model aims to reduce the influence of the spot that produces in the external environment to the normal work of temperature sensing cable, compare prior art and provide a but recovery formula constant temperature type temperature sensing cable, the outside cladding through first galvanized steel wire has NTC negative resistance material, the outside cladding of NTC negative resistance material has dacron single silk screen, the outside cladding of second galvanized steel wire has the semiconductor material cover, first galvanized steel wire and second galvanized steel wire transposition each other forms the temperature sensing pencil together, the outside winding of temperature sensing pencil has the compound area of plastic-aluminum, the outside cladding of plastic-aluminum compound area has the oversheath, the outside cover of oversheath is equipped with the dust cover, the dust cover includes a plurality of solid fixed rings, fixedly connected with adheres to the net between two adjacent solid fixed rings, the one end fixedly connected with a plurality of elastic fiber that adheres to the net and keeps away from the oversheath, a plurality of elastic fiber all are the three-dimensional heliciform, adjacent elastic fiber winding forms three-dimensional space spatial stereo structure together, elastic fiber chooses for use high heat conduction material to make, realize being difficult for use and influence the giving off of the heat that produces when the temperature sensing cable normal work, can not influence its supervision to the environmental temperature monitoring, increase the degree of accuracy that detects, be difficult for the temperature sensing cable, be difficult for the wrong report to arouse or do not normally the alarm phenomenon.
Optionally, the fixing ring includes a connecting ring, a positioning ring is fixedly connected to an inner wall of the connecting ring, and the positioning ring is in direct contact with the outer sheath.
Optionally, one end of the positioning ring, which is close to the connection ring, is provided with a plurality of communication holes, and the plurality of communication holes all penetrate through the positioning ring, so that the conductivity of the heat on the surface of the outer sheath is further increased, and the local heat of the outer sheath is not easily excessively accumulated due to the arrangement of the fixing ring.
Optionally, the one end that the go-between was kept away from to the holding ring has the inward contraction trend, and the one end that the go-between was kept away from to the holding ring is dug there is the frosting line, further increases the joint strength between solid fixed ring and the oversheath for a plurality of solid fixed rings are difficult for slideing on the oversheath, are difficult for influencing the normal use of dust cover.
Optionally, the connecting rings are made of magnetic rubber, the two adjacent connecting rings tend to be attracted, and the adjacent connecting rings can be stacked together in the process of storing and transporting the dust cover, so that the dust cover is convenient to store and transport.
It is optional, elastic fiber includes the hot melt material core, the hot melt material core is close to the one end of adhering to the net and adheres to net fixed connection, the outside cover of hot melt material core is equipped with the outer coating, the conflagration takes place in the external world, and when igniting elastic fiber, the high temperature of flame can melt the hot melt material core, reduce elastic fiber and adhere to the joint strength between the net, later under the effect of a plurality of windings elastic fiber dead weights together, make elastic fiber follow to drop on adhering to the net, slow down stretching of flame on the temperature sensing cable, the working life of extension temperature sensing cable.
Optionally, the softening temperature of the hot-melt material core is higher than the alarm temperature of the first galvanized steel wire, so that the elastic fiber is further not prone to fail in advance.
Optionally, the hot melt material core is adhered to the attachment net after being close to the local melting of the attachment net, and further the hot melt material core can be directly fixed to the attachment net, so that the production of the dust cover is facilitated.
Optionally, the outer coating is made of a hydrophilic material, and further, in a humid environment, water vapor cannot easily penetrate through the elastic fibers to adhere foreign matters to the surface of the outer sheath, so that normal work of the temperature sensing cable cannot be easily influenced.
Optionally, the outer side of the attachment net is provided with a pre-folding line, so that the dust cover can be integrally stored and stacked conveniently.
Compare in prior art, the advantage of this application lies in:
in this scheme, the first galvanized steel wire that has wrapped NTC negative resistance material and dacron single silk screen and the second galvanized steel wire of cladding semiconductor material cover strand together, the conflagration takes place in the external world, when the temperature rose, can cause NTC negative resistance material to melt and dip in dacron single silk screen, first galvanized steel wire and second galvanized steel wire realize the contact through semiconductor material cover and NTC negative resistance material and connect this moment, the temperature sensing cable short circuit, the detection device who is connected with the temperature sensing cable can detect the change of above-mentioned signal of telecommunication, and send out the police dispatch newspaper, in time discover the conflagration.
When the temperature of the temperature sensing cable is too high locally, the temperature between the attachment net and the outer sheath rises to form hot air flow from the outer sheath to the attachment net, and a plurality of elastic fibers which are originally three-dimensional spiral are blown away, so that the accumulated heat is dissipated along with the hot air, and the dust accumulated on the elastic fibers is ejected out at the moment when the elastic fibers are blown away, so that the elastic fibers are cleaned.
Finally, when a fire disaster occurs outside and the elastic fiber is ignited, the high temperature of the flame can melt the hot-melt material core, the connection strength between the elastic fiber and the attachment net is reduced, then the elastic fiber drops off from the attachment net under the action of the dead weight of the elastic fiber wound together, the spread of the flame on the temperature sensing cable is slowed down, the service life of the temperature sensing cable is prolonged, the softening temperature of the hot-melt material core is higher than the alarm temperature of the first galvanized steel wire, and the elastic fiber is not easy to fail in advance.
Drawings
Fig. 1 is a schematic sectional view of a main structure of a recoverable constant temperature type temperature sensing cable according to the present application;
FIG. 2 is a schematic view of the structure at A in FIG. 1;
fig. 3 is a schematic structural view of the constant temperature type temperature sensing cable of the present application after being sleeved with a dust cover;
FIG. 4 is a side cross-sectional view of the dust cap of the present application;
FIG. 5 is a schematic view of the structure at B in FIG. 4;
FIG. 6 is a view of a retaining ring of the present application;
FIG. 7 is a schematic view of a structural variation of the operation of the dust cap of the present application;
FIG. 8 is a schematic view of the operation of the dust cap of the present application;
FIG. 9 is a partial schematic view of the attachment web and elastic fiber junction of the present application;
FIG. 10 is a schematic view of the dust cap of the present application in rolled configuration;
fig. 11 is a schematic view of the winding of the attachment web of the present application.
The numbering in the figures illustrates:
11 first galvanized steel wires, 12 second galvanized steel wires, 2 NTC negative resistance materials, 3 terylene single silk screens, 4 semiconductor material sleeves, 5 aluminum-plastic composite belts, 6 outer sheaths, 7 fixing rings, 701 positioning rings, 702 communication holes, 703 connection rings, 8 attachment nets, 9 elastic fibers, 901 hot melt material cores and 902 outer coatings.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments in the present application belong to the protection scope of the present application.
Example 1:
the application discloses but recovery formula is warm type temperature sensing cable surely, please refer to fig. 1-2, including a pair of first galvanized steel wire 11 and the second galvanized steel wire 12 that matches each other, the outside cladding of first galvanized steel wire 11 has NTC negative resistance material 2, the outside cladding of NTC negative resistance material 2 has dacron single silk screen 3, the outside cladding of second galvanized steel wire 12 has semiconductor material cover 4, first galvanized steel wire 11 and second galvanized steel wire 12 twist together each other and form the temperature sensing pencil, the outside winding of temperature sensing pencil has plastic-aluminum composite tape 5, the outside cladding of plastic-aluminum composite tape 5 has oversheath 6.
Wherein, the first galvanized steel wire 11 of the first galvanized steel wire 11 and the second galvanized steel wire 12 of the second cover of semiconductor material 4 that have wrapped NTC negative resistance material 2 and dacron single silk screen 3 are twisted together, the conflagration takes place in the external world, when the temperature rises, can cause NTC negative resistance material 2 to melt and dip in dacron single silk screen 3, first galvanized steel wire 11 and second galvanized steel wire 12 realize the contact through semiconductor material cover 4 and NTC negative resistance material 2 and are connected this moment, the temperature sensing cable short circuit, the detection device who is connected with the temperature sensing cable can detect the change of above-mentioned signal of telecommunication, and send out the police dispatch newspaper, in time discover the conflagration.
Example 2:
the application discloses but recovery formula is warm type temperature sensing cable surely, please refer to fig. 3-10, the outside cover of oversheath 6 is equipped with the dust cover, the dust cover includes a plurality of solid fixed rings 7, fixedly connected with adheres to net 8 between two adjacent solid fixed rings 7, adhere to the net 8 and keep away from a plurality of elastic fiber 9 of one end fixedly connected with of oversheath 6, a plurality of elastic fiber 9 all are three-dimensional heliciform, adjacent elastic fiber 9 twines and forms three-dimensional space spatial structure together, elastic fiber 9 chooses for use high heat conduction material to make, gu fixed ring 7 includes go-between 703, fixedly connected with holding ring 701 on the inner wall of go-between 703, holding ring 701 and oversheath 6 direct contact, the one end that the holding ring 701 is close to go-between 703 is opened and is dug a plurality of intercommunicating holes 702, a plurality of intercommunicating holes 702 all run through holding ring 701, increase the conductibility of oversheath 6 surface heat, be difficult for leading to oversheath 6 local heat excessive gathering because of the setting of solid fixed ring 7.
In particular, in this scheme, in order to demonstrate the needs, the structures of the dust cover in the drawings of this application are not drawn strictly according to actual dimensions, and those skilled in the art can design reasonably according to actual needs.
When the temperature sensing cable normally works, heat generated by the operation of the first galvanized steel wires 11 and the second galvanized steel wires 12 can be dissipated to the outside through the elastic fibers 9, foreign matters such as external dust can be isolated to the outside by the elastic fibers 9 and are not easy to directly adhere to the surface of the outer sheath 6, meanwhile, due to the digging of the communication holes 702, even if the local part of the elastic fibers 9 is contaminated by a large amount of dust, the heat cannot be dissipated in time, the heat can also flow through the connection ring 703, the phenomenon of overhigh local temperature of the temperature sensing cable is not easy to occur, when the local part of the temperature sensing cable has overhigh temperature, the temperature between the attachment net 8 and the outer sheath 6 rises, hot air flowing from the outer sheath 6 to the attachment net 8 is formed, and a plurality of elastic fibers 9 originally in a three-dimensional spiral shape are dissipated, so that the accumulated heat is dissipated along with hot air, and the dust accumulated on the elastic fibers 9 can be ejected out at the moment when the elastic fibers 9 are dissipated, and the elastic fibers 9 are cleaned.
One end of the positioning ring 701, which is far away from the connecting ring 703, has an inward contraction trend, one end of the positioning ring 701, which is far away from the connecting ring 703, is provided with frosted grains, so that the connection strength between the fixing rings 7 and the outer sheath 6 is increased, the fixing rings 7 are not easy to slide on the outer sheath 6, the normal use of the dust cover is not easy to be influenced, the connecting rings 703 are made of magnetic rubber, the adjacent connecting rings 703 have an adsorption trend, in the process of storing and transporting the dust cover, the adjacent connecting rings 703 can be stacked together, so that the dust cover is convenient to store and transport, the elastic fiber 9 comprises a hot-melt material core 901, one end of the hot-melt material core 901, which is close to the attachment net 8, is fixedly connected with the attachment net 8, the outer side of the hot-melt material core 901 is sleeved with an outer covering layer 902, when a fire disaster occurs outside, and the elastic fiber 9 is ignited, the hot-melt material core 901 can be melted by the high temperature of the flame, the connection strength between the elastic fiber 9 and the attachment net 8 is reduced, then under the action of the dead weight of the elastic fibers 9 which are wound together, the elastic fibers 9 fall off from the attachment net 8, the spread of flame on the temperature sensing cable is slowed down, the service life of the temperature sensing cable is prolonged, the softening temperature of the hot-melt material core 901 is higher than the alarm temperature of the first galvanized steel wire 11, so that the elastic fibers 9 are not easy to fail in advance, the hot-melt material core 901 is adhered to the attachment net 8 after being locally melted close to the attachment net 8, the hot-melt material core 901 can be directly fixed on the attachment net 8, the production of the dust cover is facilitated, the outer coating 902 is made of a hydrophilic material, under a humid environment, water vapor is not easy to penetrate through the elastic fibers 9 to adhere foreign matters on the surface of the outer sheath 6, the normal work of the temperature sensing cable is not easy to be influenced, the outer side of the attachment net 8 is provided with pre-folding lines, the dust cover is convenient to be integrally stored and stacked.
The above description is only for the preferred embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art should be covered by the present application in the technical scope disclosed in the present application, and the technical solutions and the modified concepts thereof should be equally replaced or changed within the scope of the present application.

Claims (10)

1. A recoverable temperature-fixed temperature-sensitive cable comprises a pair of first galvanized steel wires (11) and a pair of second galvanized steel wires (12) which are matched with each other, and is characterized in that the outer sides of the first galvanized steel wires (11) are coated with NTC negative resistance materials (2), the outer sides of the NTC negative resistance materials (2) are coated with polyester single silk screens (3), the outer sides of the second galvanized steel wires (12) are coated with semiconductor material sleeves (4), the first galvanized steel wires (11) and the second galvanized steel wires (12) are twisted with each other to form a temperature-sensitive wire harness, the outer sides of the temperature-sensitive wire harness are wound with aluminum-plastic composite belts (5), the outer sides of the aluminum-plastic composite belts (5) are coated with outer sheaths (6), the outer side of the outer sheath (6) is sleeved with a dust cover, the dust cover comprises a plurality of fixing rings (7), an attaching net (8) is fixedly connected between every two adjacent fixing rings (7), one end, far away from the outer sheath (6), of the attaching net (8) is fixedly connected with a plurality of elastic fibers (9), the elastic fibers (9) are all in a three-dimensional spiral shape, the adjacent elastic fibers (9) are wound together to form a three-dimensional space three-dimensional structure, the elastic fibers (9) are made of high-heat-conduction materials, when the temperature of the temperature sensing cable is overhigh locally, the temperature between the attaching net (8) and the outer sheath (6) rises to form hot air flow from the outer sheath (6) to the attaching net (8), and a plurality of elastic fibers (9) which are originally in a three-dimensional spiral shape are blown away, so that the accumulated heat is dissipated along with the hot air, and the dust accumulated on the elastic fibers (9) is ejected out at the moment when the elastic fibers (9) are blown away, thereby cleaning the elastic fibers (9).
2. The temperature-sensing cable of claim 1, wherein the fixing ring (7) comprises a connecting ring (703), a positioning ring (701) is fixedly connected to an inner wall of the connecting ring (703), and the positioning ring (701) is in direct contact with the outer sheath (6).
3. The temperature-sensing cable of claim 2, wherein the positioning ring (701) has a plurality of communication holes (702) cut at an end thereof adjacent to the connection ring (703), and the plurality of communication holes (702) extend through the positioning ring (701).
4. The recoverable constant temperature-sensitive cable of claim 2, wherein an end of the positioning ring (701) remote from the connection ring (703) has an inward-contracting tendency, and an end of the positioning ring (701) remote from the connection ring (703) is chiseled with frosted lines.
5. The recoverable constant temperature type temperature sensing cable according to claim 2, wherein the connection rings (703) are made of magnetic rubber, and the connection rings (703) have an adsorption tendency.
6. The recoverable constant temperature type temperature sensing cable according to claim 1, wherein the elastic fibers (9) comprise a hot-melt material core (901), one end of the hot-melt material core (901), which is close to the attachment net (8), is fixedly connected with the attachment net (8), and an outer cover (902) is sleeved on the outer side of the hot-melt material core (901).
7. The recoverable constant temperature-sensitive cable according to claim 6, wherein the temperature at which the core (901) of the hot-melt material softens is higher than the alarm temperature of the first galvanized steel wires (11).
8. A recoverable temperature-sensing cable according to claim 6, wherein said core (901) of hot-melt material is bonded to the attachment web (8) by locally melting the portion of the core adjacent to the attachment web (8).
9. The recoverable constant temperature-sensitive cable of claim 6, wherein the outer coating (902) is made of a hydrophilic material.
10. A recoverable constant temperature type temperature sensitive cable according to claim 1, wherein said attachment web (8) is pre-creased on its outer side.
CN202210924463.1A 2022-08-03 2022-08-03 Recoverable constant temperature type temperature sensing cable Active CN114993503B (en)

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Citations (8)

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Publication number Priority date Publication date Assignee Title
CN101078654A (en) * 2007-07-05 2007-11-28 张陈 Recoverable cable type linear temperature-sensing detector
WO2008046249A1 (en) * 2006-10-19 2008-04-24 Weishe Zhang A nonrenewable linear temperature-sensing detector with alarm about short-circuit trouble
CN101343394A (en) * 2007-07-10 2009-01-14 孔凡亮 Fire-proof flame-proof fluoroplastics and fire-proof flame-proof cable
CN102074289A (en) * 2011-01-28 2011-05-25 周海燕 Flame-retardant cable
CN102790367A (en) * 2012-07-16 2012-11-21 河南省电力公司信阳供电公司 Dust preventing device for cable trench
CN102867586A (en) * 2011-07-04 2013-01-09 尼克桑斯公司 Corrosion resistant fireproof electric cable
CN104332233A (en) * 2014-11-07 2015-02-04 四川领创宝岩电子科技有限公司 Environmentally-friendly fireproof, insulated and anti-corrosive armored cable
CN107828142A (en) * 2017-09-22 2018-03-23 武汉亿维登科技发展有限公司 A kind of water proof and dust proof cable

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101164639B (en) * 2006-10-19 2012-04-18 首安工业消防有限公司 Recovery-free type linear temperature-sensitive detector with short-circuit fault alarm

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008046249A1 (en) * 2006-10-19 2008-04-24 Weishe Zhang A nonrenewable linear temperature-sensing detector with alarm about short-circuit trouble
CN101078654A (en) * 2007-07-05 2007-11-28 张陈 Recoverable cable type linear temperature-sensing detector
CN101343394A (en) * 2007-07-10 2009-01-14 孔凡亮 Fire-proof flame-proof fluoroplastics and fire-proof flame-proof cable
CN102074289A (en) * 2011-01-28 2011-05-25 周海燕 Flame-retardant cable
CN102867586A (en) * 2011-07-04 2013-01-09 尼克桑斯公司 Corrosion resistant fireproof electric cable
CN102790367A (en) * 2012-07-16 2012-11-21 河南省电力公司信阳供电公司 Dust preventing device for cable trench
CN104332233A (en) * 2014-11-07 2015-02-04 四川领创宝岩电子科技有限公司 Environmentally-friendly fireproof, insulated and anti-corrosive armored cable
CN107828142A (en) * 2017-09-22 2018-03-23 武汉亿维登科技发展有限公司 A kind of water proof and dust proof cable

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