CN112261748A - Explosion-proof self-temperature-limiting electric tracing band - Google Patents
Explosion-proof self-temperature-limiting electric tracing band Download PDFInfo
- Publication number
- CN112261748A CN112261748A CN202011212567.7A CN202011212567A CN112261748A CN 112261748 A CN112261748 A CN 112261748A CN 202011212567 A CN202011212567 A CN 202011212567A CN 112261748 A CN112261748 A CN 112261748A
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- Prior art keywords
- explosion
- tracing band
- temperature
- proof
- switch
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- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000004880 explosion Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005485 electric heating Methods 0.000 claims 2
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000013021 overheating Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229920001940 conductive polymer Polymers 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/56—Heating cables
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an explosion-proof self-temperature-limiting point heat tracing band which comprises an electric heat tracing band body, a junction box, a power cable and an explosion-proof device, wherein the head end of the electric heat tracing band is connected with one end of the junction box, the other end of the junction box is connected with one end of the power cable, and the other end of the power cable is connected with the explosion-proof device; the explosion-proof device is arranged between the power supply and the power cable and used for detecting the temperature of the electric tracing band main body so as to connect or cut off the power supply and limit the current of the electric tracing band. The detection circuit, the protection circuit and the control circuits are arranged in the electric tracing band protection device, so that a plurality of protection modes exist in the electric tracing band, and a power supply can be cut off in any mode, so that the explosion problem caused by overcurrent and overheating is prevented.
Description
Technical Field
The invention relates to the technical field of electric tracing bands, in particular to an explosion-proof self-temperature-limiting electric tracing band.
Background
The electric tracing band is composed of conductive polymer, two parallel metal wires and an insulating protective layer. The electric tracing band is characterized in that the conductive polymers have the characteristic of high positive temperature coefficient, are connected in parallel, can automatically adjust the output power along with the temperature change of a heated system, automatically limit the heating temperature, can be randomly shortened or lengthened in a certain range for use, and is suitable for temperature control, heat tracing, heat preservation and heating of pipelines, equipment and containers.
Disclosure of Invention
The invention aims to provide an explosion-proof self-temperature-limiting electric tracing band to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the anti-explosion self-temperature-limiting-point heat tracing band comprises an electric tracing band body, a junction box, a power cable and an anti-explosion device, wherein the head end of the electric tracing band is connected with one end of the junction box, the other end of the junction box is connected with one end of the power cable, and the other end of the power cable is connected with the anti-explosion device;
the explosion-proof device is arranged between the power supply and the power cable and used for detecting the temperature of the electric tracing band main body so as to connect or cut off the power supply and limit the current of the electric tracing band.
In the technical scheme, the electric tracing band is preferably a self-temperature-limiting electric tracing band.
In the technical scheme, the power cable is preferably a plastic insulation power cable or a rubber insulation power cable.
In the technical scheme, the explosion-proof device comprises a control circuit, and the control circuit comprises a first control circuit and a second control circuit.
Preferred in technical scheme, first control circuit includes electricity-saving appliance K1, the one end and the zero line of relay K1 are connected, the other end and the one end of frequency conversion output switch D1 of relay K1 are connected, frequency conversion output switch D1's the other end and normally closed contact switch K5's one end are connected, normally closed contact switch K5's the other end and the one end of circular telegram time delay relay KT1 are connected, circular telegram time delay relay KT 1's the other end is connected with circuit breaker QF 1's one end, circuit breaker QF 1's the other end and live wire are connected.
Preferably in the technical scheme, the one end of second control circuit relay K2 is connected with the one end of circuit breaker QF1, the other end of relay K2 is connected with the one end of frequency conversion output switch D2, the other end of frequency conversion output switch D2 is connected with the one end of normally closed electric shock switch K6, the other end and the one end of circular telegram time delay relay KT2 of normally closed contact switch K6 are connected, the other end and the live wire of circular telegram time delay relay KT2 are connected.
In the technical scheme, the explosion-proof device preferably further comprises a detection circuit, and the detection circuit is arranged at the front end of the control circuit.
Preferred among the technical scheme, the one end of circular telegram delay switch KT3 of detection return circuit is connected with the zero line, circular telegram delay switch KT 3's other end voltage regulator TY1 is connected, voltage regulator TY 1's the other end is connected with electric leakage detection module LD 1's one end, electric leakage detection module LD 1's the other end divides two parallelly connected back grounds of branch, and the one end of normally closed contact switch K6 on one of them branch road is connected with electric leakage detection module LD 1's the other end, normally closed contact switch K6's the other end is connected with frequency conversion output switch D3's one end, frequency conversion output switch D3's the other end is connected the back direct ground with another branch road.
In the technical solution, preferably, a power output end of the leakage detecting module LD1 is connected to the other end of the breaker QF 1.
In the technical scheme, the explosion-proof device further comprises a protection circuit, the protection circuit comprises a self-current limiter FA2, one end of the self-current limiter FA2 is connected with a live wire, the other end of the self-current limiter FA2 is connected with one end of an electrified delay switch KT4, and the other end of the electrified delay switch KT4 is connected with a zero wire.
Compared with the prior art, the invention has the following beneficial effects:
the detection circuit, the protection circuit and the control circuits are arranged in the electric tracing band protection device, so that a plurality of protection modes exist in the electric tracing band, and a power supply can be cut off in any mode, so that the explosion problem caused by overcurrent and overheating is prevented.
Drawings
FIG. 1 is a schematic structural view of an electric tracing band according to the present invention;
fig. 2 is a schematic circuit diagram of the explosion-proof device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an explosion-proof self-temperature-limiting electric tracing band includes an electric tracing band body 1, a junction box 2, a power cable 3 and an explosion-proof device 4, wherein a head end of the electric tracing band 1 is connected with one end of the junction box 2, one end of the power cable 3 at the other end of the junction box 2 is connected, and the other end of the power cable 3 is connected with the explosion-proof device 4.
Further, the electric tracing band 1 is a common electric tracing band in the market; a self-limiting electric tracing band is preferred in this embodiment. Furthermore, the self-temperature-limiting electric tracing band can be formed by nano conductive carbon particles and two parallel bus bars with an insulating layer.
Further, the terminal box 2 is preferably an explosion-proof terminal box in the present embodiment, and the type and specification thereof may be selected as required.
Further, the power cable 3 is a plastic-insulated power cable or a rubber-insulated power cable.
Further, an explosion-proof device 4 is disposed between the power supply and the power cable 3, and is used for detecting the temperature of the electric tracing band main body 1 to connect or disconnect the power supply and simultaneously limit the current of the electric tracing band.
Specifically, as shown in fig. 2, the explosion-proof device 4 includes a control circuit including a first control circuit and a second control circuit. The first control loop comprises an electricity saver K1, one end of a relay K1 is connected with a zero line, the other end of the relay K1 is connected with one end of a variable-frequency output switch D1, the other end of the variable-frequency output switch D1 is connected with one end of a normally closed contact switch K5, the other end of the normally closed contact switch K5 is connected with one end of an electrified delay relay KT1, the other end of the electrified delay relay KT1 is connected with one end of a breaker QF1, and the other end of the breaker QF1 is connected with a live wire. One end of a second control circuit relay K2 is connected with one end of a breaker QF1, the other end of the relay K2 is connected with one end of a variable-frequency output switch D2, the other end of the variable-frequency output switch D2 is connected with one end of a normally closed contact switch K6, the other end of the normally closed contact switch K6 is connected with one end of an electrified delay relay KT2, and the other end of the electrified delay relay KT2 is connected with a live wire. Further, a relay K1 is connected in parallel with the self current limiter KA1 for protection of the first control loop.
Further, referring to fig. 2, the explosion-proof device 4 further includes a detection circuit, and the detection circuit is disposed at the front end or the rear end of the control circuit, and is preferably disposed at the front end of the control circuit. One end of a power-on delay switch KT3 of the detection loop is connected with a zero line, the other end of the power-on delay switch KT3 is connected with a voltage regulator TY1, the other end of the voltage regulator TY1 is connected with one end of a leakage detection module LD1, the other end of the leakage detection module LD1 is divided into two branches which are connected in parallel and then grounded, one end of a normally closed contact switch K6 on one branch is connected with the other end of the leakage detection module LD1, the other end of the normally closed contact switch K6 is connected with one end of a variable-frequency output switch D3, and the other end of the variable-frequency output switch D3 is directly grounded after being connected with. One power output end of the electric leakage detection module LD1 is connected with the other end of the breaker QF 1.
Furthermore, the explosion-proof device 4 further comprises a protection circuit, the protection circuit comprises a self-current limiter FA2, one end of the self-current limiter FA2 is connected with a live wire, the other end of the self-current limiter FA2 is connected with one end of an electrified delay switch KT4, and the other end of the electrified delay switch KT4 is connected with a zero wire.
The working principle of the explosion-proof device is as follows: after the power supply is electrified, a live wire L and a zero wire N of 220V are electrified, the power supply delay relay KT1 of the explosion-proof frequency converter starts to time, and after the time supply delay relay KT1 finishes timing (10 seconds, 20 seconds or 30 seconds can be set); the leakage locking module LD starts to detect whether the electric tracing band has short circuit to the ground or interphase short circuit, if so, the normally closed contact of the leakage locking module LD is changed from the normally closed contact to the normally open contact, then the coil of the relay K5 is also attracted, and the power supply of the main circuit (the circuit in the explosion-proof frequency converter) of the explosion-proof frequency converter is cut off; if not, the next step is carried out, a time delay relay is powered on, meanwhile, the explosion-proof frequency converter starts to store electricity, when the voltage D1 of the frequency converter rises to be more than 80%, the D1 is changed from a normally open contact to a normally closed contact, the coil of the relay K1 is attracted, the normally open contact of the corresponding relay K1 is changed into the normally closed contact, and the normally closed contact is changed into the normally open contact, so that the normally open contact is used as explosion protection. The second loop operates on the same principle as the geographical loop and acts as a backup control loop.
When the electric tracing band is used in a specific mode, under the condition that the electric tracing band works normally, the breaker QF1 keeps an off state, the detection loop keeps normal power output, and the relay K1, the variable-frequency transformer D1 and the electrified delay switch KT1 keep an on state. When the temperature of the electric tracing band is overhigh and the current is overlarge, the power output end of the leakage locking module LD is closed, the first control loop and the second control loop are disconnected, and the protection circuit is disconnected under the interaction of the self-current limiter FA2 and the electrified delay switch KT4, so that the explosion-proof effect is achieved.
In the invention, because the detection circuit, the protection circuit and the control circuits are arranged, the electric tracing band has a plurality of protection modes, and the power supply can be cut off in any mode, thereby preventing the explosion problem caused by overcurrent and overheating.
The component structures, connection relationships, operation principles, and the like, which are not described in the present embodiment, are realized by using the prior art, and a description thereof will not be repeated.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An explosion-proof self-temperature-limiting-point heat tracing band is characterized by comprising an electric tracing band body, a junction box, a power cable and an explosion-proof device, wherein the head end of the electric tracing band is connected with one end of the junction box, the other end of the junction box is connected with one end of the power cable, and the other end of the power cable is connected with the explosion-proof device;
the explosion-proof device is arranged between the power supply and the power cable and used for detecting the temperature of the electric tracing band main body so as to connect or cut off the power supply and limit the current of the electric tracing band.
2. The explosion proof self limiting temperature point heating cable according to claim 1, wherein the electric heating cable is a self limiting temperature electric heating cable.
3. The explosion-proof self limiting temperature point heat tracing band of claim 1, wherein the power cable is a plastic-insulated power cable or a rubber-insulated power cable.
4. The explosion proof self limiting temperature point heat tracing band of claim 1, wherein the explosion proof device comprises a control loop comprising a first control loop and a second control loop.
5. The explosion-proof self temperature-limiting point heat tracing belt according to claim 1, wherein the first control circuit comprises a power saver K1, one end of a relay K1 is connected with a zero line, the other end of the relay K1 is connected with one end of a variable frequency output switch D1, the other end of the variable frequency output switch D1 is connected with one end of a normally closed contact switch K5, the other end of the normally closed contact switch K5 is connected with one end of an electrifying delay relay KT1, the other end of the electrifying delay relay KT1 is connected with one end of a circuit breaker QF1, and the other end of the circuit breaker QF1 is connected with a live line.
6. The explosion-proof self temperature-limiting point heat tracing belt of claim 1, wherein one end of the second control circuit relay K2 is connected with one end of a breaker QF1, the other end of the relay K2 is connected with one end of a variable frequency output switch D2, the other end of the variable frequency output switch D2 is connected with one end of a normally closed contact switch K6, the other end of the normally closed contact switch K6 is connected with one end of an electrified delay relay KT2, and the other end of the electrified delay relay KT2 is connected with a live wire.
7. The explosion-proof self temperature limiting point heat tracing band of claim 4, further comprising a detection loop in the explosion-proof device, wherein the detection loop is arranged at the front end of the control loop.
8. The explosion-proof self temperature-limiting point heat tracing band of claim 7, wherein one end of a power-on delay switch KT3 of said detection loop is connected with a zero line, the other end of said power-on delay switch KT3 is connected with a voltage regulator TY1, the other end of said voltage regulator TY1 is connected with one end of a leakage detection module LD1, the other end of said leakage detection module LD1 is divided into two branches which are connected in parallel and then grounded, one end of a normally closed contact switch K6 on one branch is connected with the other end of said leakage detection module LD1, the other end of said normally closed contact switch K6 is connected with one end of a frequency conversion output switch D3, and the other end of said frequency conversion output switch D3 is connected with the other branch and then directly grounded.
9. The explosion-proof self temperature-limiting heat tracing belt of claim 8, wherein a power output terminal of said leakage detecting module LD1 is connected with the other terminal of the breaker QF 1.
10. The explosion-proof self temperature-limiting point heating cable according to claim 4, wherein the explosion-proof device further comprises a protection circuit, the protection circuit comprises a self current limiter FA2, one end of the self current limiter FA2 is connected with a live wire, the other end of the self current limiter FA2 is connected with one end of an electrified delay switch KT4, and the other end of the electrified delay switch KT4 is connected with a neutral wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011212567.7A CN112261748A (en) | 2020-11-03 | 2020-11-03 | Explosion-proof self-temperature-limiting electric tracing band |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011212567.7A CN112261748A (en) | 2020-11-03 | 2020-11-03 | Explosion-proof self-temperature-limiting electric tracing band |
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| Publication Number | Publication Date |
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| CN112261748A true CN112261748A (en) | 2021-01-22 |
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| CN202011212567.7A Pending CN112261748A (en) | 2020-11-03 | 2020-11-03 | Explosion-proof self-temperature-limiting electric tracing band |
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| KR100660105B1 (en) * | 2006-09-18 | 2006-12-20 | 심현우 | Explosion-proof electric heater |
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| CN211008572U (en) * | 2019-10-11 | 2020-07-14 | 盘锦辽河油田金宇集团有限公司 | Intelligent heating device for large oil well tank |
| CN211203271U (en) * | 2019-09-26 | 2020-08-07 | 中国石油天然气股份有限公司 | Pipeline heat tracing device |
| CN211656422U (en) * | 2020-04-20 | 2020-10-09 | 路晓刚 | Water surface ice melting device |
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2020
- 2020-11-03 CN CN202011212567.7A patent/CN112261748A/en active Pending
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| CN2666077Y (en) * | 2003-10-21 | 2004-12-22 | 孙晋生 | Anti-explosive heating cable |
| KR100660105B1 (en) * | 2006-09-18 | 2006-12-20 | 심현우 | Explosion-proof electric heater |
| CN201655674U (en) * | 2009-07-20 | 2010-11-24 | 北京航天时空科技有限公司 | Explosion-proof power supply device |
| CN204028247U (en) * | 2014-07-14 | 2014-12-17 | 武汉合康防爆电气有限公司 | A kind of explosion-proof frequency converter loop is detected and feedback sense circuit |
| CN205089581U (en) * | 2015-09-29 | 2016-03-16 | 河南晋开化工投资控股集团有限责任公司 | Compressor double pump fuel feeding interlocking control circuit |
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Application publication date: 20210122 |
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