CN102883481B - High-temperature-resistant double-helix coil type heating element - Google Patents
High-temperature-resistant double-helix coil type heating element Download PDFInfo
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- CN102883481B CN102883481B CN201210359028.5A CN201210359028A CN102883481B CN 102883481 B CN102883481 B CN 102883481B CN 201210359028 A CN201210359028 A CN 201210359028A CN 102883481 B CN102883481 B CN 102883481B
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Abstract
The invention provides a high-temperature-resistant double-helix coil type heating element which can be reliably started under severe conditions of high temperature, high humidity, high radiation and the like, and has the advantages of good sealing effect and low energy consumption. The heating element adopts a 220 V power supply; the temperature of the element can quickly reach more than 930 DEG C; and the element can continuously work more than 72 hours. According to the invention, the double-helix type heating coil is adopted, so that the heat quantity centralization of a resistance wire in using is ensured, and the temperature rise is quick. In order to adapt to the high temperature environment, the tail part of the heating element adopts a high-temperature-resistant design that insulating materials in a housing is sealed in a way that a ceramic ring, a sealing ring and a sleeve chuck are matched, so that the insulating materials can effectively keep the insulation and moisture protection of the double-helix coil and ensure the smooth starting of the heating element. The heating element provided by the invention is particularly suitable for closed space of a nuclear power plant and the like.
Description
Technical field
Invention relates to a kind of heating element, is specifically related to a kind of resistant to elevated temperatures double-spiral coil type heating element.
Background technology
After nuclear power station generation design basis accident or serious accident, owing to there is chemical reaction between zirconium in water vapour and fuel sheath, produce at short notice a large amount of hydrogen.Due to reacting between the RADIATION DECOMPOSITION of water and reactor core fused mass and concrete, also a large amount of hydrogen will be produced in addition.As under serious accident condition, more than the generation speed of hydrogen can reach 2Kg/s.If a large amount of hydrogen that produce can not be eliminated fast and effectively, once on a large scale, the hydrogen mixed gas of high concentration blasts, by the integrality of entail dangers to containment.Therefore the U.S., Europe and multiple countries such as Chinese explicitly call for, and must consider the measure that keeps containment integrity under serious accident, particularly must consider to estimate the incendiary effect of the various fuel gas that occur.
The hydrogen producing for Accident prevention occurs on a large scale, the blast of high concentration, and people adopt the special equipment such as hydrogen recombiner, hydrogen igniter to carry out hydrogen elimination.But the igniter of hydrogen igniter, only for design basis accident, had the shortcomings such as energy consumption is large, heatproof is low in the past, as the high ambient temperature bearing is no more than 125 DEG C.And adopt at present the nuclear power station that third generation technology is built that once serious accident occurs, will in the short time, produce a large amount of hydrogen in containment, ambient temperature is up to more than 300 DEG C simultaneously, therefore the hydrogen igniter in the past hydrogen that can not normal ignition disappears.Occur in addition after serious accident; the safety means electricity consumption of nuclear power station may rely on reserve battery completely; if adopt traditional hydrogen igniter to eliminate hydrogen, can, because the high-power of itself will consume the valuable electric energy of reserve battery very soon, cause cannot continuing to protect the safety of containment.Therefore the generation Ⅲ nuclear power station that the heating element of hydrogen igniter can not meet the construction of employing AP1000 technology is about the instructions for use under serious accident condition in the past.
Summary of the invention
In view of this, the invention provides a kind of resistant to elevated temperatures double-spiral coil type heating element, can under high temperature, high humidity and high radiation condition, realize Fast Heating or igniting, and good sealing effect, energy consumption is low.
This heating element comprises helical coil, housing, insulating material, wire connecting screw rod A, wire connecting screw rod B, sealing ring, ceramic ring A, ceramic ring B, cutting ferrule A, cutting ferrule B, jacking nut and clamp nut.Wherein cutting ferrule A, cutting ferrule B and sealing ring all adopt exotic material to make.
Described helical coil comprises resistance wire, insulated tube and metal tube.Resistance wire runs through insulated tube, at the outside of insulated tube suit metal tube.The heat of resistance wire is concentrated when ensureing to use, and quick heating is processed into helical form after being set with the metal tube doubling of insulated tube, forms helical coil, and helical coil has two parallel outputs.If the two ends of resistance wire are respectively side a and b, the side a and b of resistance wire stretches out respectively two outputs of helical coil.
Its overall annexation is: one end sealing of described housing, and one end perforate, housing endoporus is made up of straight hole and bellmouth, and the large end of described bellmouth is positioned at the openend of housing.Two outputs of helical coil are stretched in housing from the blind end of housing, thereby the A of resistance wire is held by being connected with the wire connecting screw rod A that is positioned at housing after the insulating material in straight hole, the B of resistance wire holds by being connected with the wire connecting screw rod B that is positioned at housing after the insulating material in straight hole, ensures that the part that resistance wire stretches out helical coil output is positioned at insulating material completely.Insulating material encloses the effect of insulation and moisture to helix, can effectively open with guarantee point firearm.In order to ensure that this heating element still can normally start under high temperature, super-humid conditions and continuous firing, all adopt resistant to elevated temperatures encapsulating method at the excircle of wire connecting screw rod A and wire connecting screw rod B.
Described ceramic ring A and ceramic ring B are taper pylon, the excircle dimension of ceramic ring A is less than the excircle dimension of ceramic ring B, ceramic ring A and ceramic ring B are arranged in the bellmouth of housing successively, and wherein one end of ceramic ring A contacts with insulating material, and the other end passes through cutting ferrule A and is connected with ceramic ring B.The taper that ensures porcelain ring A and ceramic ring B is consistent with the taper of housing endoporus.Gapped between the excircle of ceramic ring A and shell inner surface, ceramic ring B contacts with shell inner surface.Described cutting ferrule A is olive shape, and center is porose, for running through wire connecting screw rod A.Wire connecting screw rod A runs through ceramic ring A, cutting ferrule A and ceramic ring B successively.In order to ensure the reliability of sealing, be processed with the side that is connected of cutting ferrule A the groove matching with cutting ferrule A profile at ceramic ring A, be processed with the side that is connected of cutting ferrule A the groove matching with cutting ferrule A profile at ceramic ring B.Wire connecting screw rod B runs through ceramic ring A, cutting ferrule B and ceramic ring B successively, and the installation form of cutting ferrule B is identical with the installation form of cutting ferrule A.Between ceramic ring A and shell inner surface, sealing ring is installed, sealing ring is taper, ensures that the taper of sealing ring is consistent with the taper of housing endoporus.
On the excircle of shell nozzle end, be processed with screw thread, for jacking nut is installed.The part that two wire connecting screw rods stretch out ceramic ring B is processed with screw thread, for clamp nut is installed.In order to prevent that jacking nut from contacting with clamp nut, the position that two wire connecting screw rods are installed on the right side of ceramic ring B is processed with projection.Jacking nut pushes ceramic ring B, cutting ferrule, ceramic ring A and sealing ring downwards successively, thereby ensures that the water vapour in external environment can not enter in housing.When power supply, power lead is connected on two wire connecting screw rods.
Material nickel, tungsten, paper tinsel, Fe-Cr-Al alloy or the nichrome of described resistance wire, preferably nichrome.
Described insulating material is aluminium oxide or the magnesium oxide of powder body material, preferential oxidation magnesium.
The thickness of described insulating material is 5mm-50mm, preferably 10mm-30mm.
The caliber of described metal tube is 1mm-6.5mm, preferably 2mm-4mm, and the length of the helical coil forming is 10mm-100mm, preferably 20mm-50mm.
The material of described ceramic ring A and ceramic ring B can be selected aluminium oxide, zirconia, silicon nitride, preferential oxidation aluminium and silicon nitride.
The material of described cutting ferrule A and cutting ferrule B can be selected polytetrafluoroethylene, rubber, graphite, preferably graphite.
The material of described sealing ring can be selected polytetrafluoroethylene, rubber, graphite, preferably graphite.
Beneficial effect:
(1) sealing ring, ceramic ring and cutting ferrule in the present invention all adopts high temperature resistant, radiation-resistant material to make, and ensures that sealing device still works under high temperature, high radiation condition, thereby heating element can normally be started and continuous firing at high temperature.
(2) will after metal tube doubling, be processed into helical form, can ensure that the heat of resistance wire is concentrated, quick heating, makes heating element energy consumption low.
(3) between ceramic ring A and housing, between sealing ring and ceramic ring B and between sealing ring and housing, all coordinate the reliability that can ensure sealing by taper surface, ensure that this heating element still can normally work under the environment of high humidity.
(4) metal tube of employing 2mm-4mm, it is concentrated that heat is convenient in processing simply simultaneously; The helical coil of 20mm-50mm is beneficial to concentrating of helical coil middle part heat, thereby ensures this heating element quick heating.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Wherein, 1-helical coil, 2-housing, 3-insulating material, 4-wire connecting screw rod A, 5-wire connecting screw rod B, 6-sealing ring, 7-ceramic ring A, 8-ceramic ring B, 9-cutting ferrule A, 10-cutting ferrule B, 11-jacking nut, 12-clamp nut, 13-resistance wire.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
The present embodiment provides a kind of resistant to elevated temperatures double-spiral coil type heating element, and this heating element can meet the generation Ⅲ nuclear power that adopts AP1000 technology to build and stand in high temperature resistant under serious accident condition and lower powered instructions for use, and starts reliably.Its concrete service condition is voltage 220V, power 120W-145W.
This heating element comprises helical coil 1, housing 2, insulating material 3, wire connecting screw rod A4, wire connecting screw rod B5, sealing ring 6, ceramic ring A7, ceramic ring B8, cutting ferrule A9, cutting ferrule B10, jacking nut 11 and clamp nut 12.In the present embodiment, all employings graphite of sealing ring 6, cutting ferrule A9 and cutting ferrule B10 is made, and the material of ceramic ring A7 and ceramic ring B8 is aluminium nitride, and insulating material 3 is magnesium oxide powder.
Described helical coil 1 comprises resistance wire 13, insulated tube and metal tube.The nickel wire that resistance wire 13 in the present embodiment is single resistance-temperature coefficient, insulated tube is magnesia tube, the caliber of metal tube is 3mm.Resistance wire 13 runs through after insulated tube, at the outside of insulated tube suit metal tube.After being set with the metal tube doubling of insulated tube, be processed into helical form, form helical coil 1, the length of the helical coil 1 forming is 40mm.Helical coil 1 has two parallel outputs.If the two ends of resistance wire 13 are respectively side a and b, the side a and b of resistance wire 13 stretches out respectively two outputs of helical coil 1.
The annexation of heating element entirety is: one end sealing of housing 2, one end perforate.The endoporus of housing 2 is made up of straight hole and bellmouth, and the large end of described bellmouth is positioned at the openend of housing 2.The insulating material 3 of 10mm is housed in described straight hole.Two outputs of helical coil 1 stretch in housing 2 from the blind end of housing 2, after the insulating material 3 that the A end of resistance wire 13 passes through, be connected with wire connecting screw rod A4, the B end of resistance wire 13 is connected with wire connecting screw rod B5 after by insulating material 3, and the part that makes the side a and b of resistance wire 13 stretch out helical coil output is positioned at insulating material 3 completely.Ceramic ring A7 and ceramic ring B8 are taper pylon, and the excircle dimension of ceramic ring A7 is less than the excircle dimension of ceramic ring B8.Ceramic ring A7 and ceramic ring B8 are arranged in the bellmouth of housing 2 successively, and the taper of porcelain ring A and ceramic ring B8 is consistent with the taper of housing 2 endoporus.Wherein gapped between the excircle of ceramic ring A7 and housing 2 inner surfaces, ceramic ring B8 contacts with housing 2 inner surfaces.One end of ceramic ring A7 contacts with insulating material 3, and the other end passes through cutting ferrule A9 and is connected with ceramic ring B8; Cutting ferrule A9 is olive shape, and center is porose, for running through wire connecting screw rod A4.Wire connecting screw rod A4 runs through ceramic ring A7, cutting ferrule A9 and ceramic ring B8 successively.In order to ensure the reliability of sealing, be processed with the side that is connected of cutting ferrule A9 the groove matching with cutting ferrule A9 profile at ceramic ring A7, be processed with the side that is connected of cutting ferrule A9 the groove matching with cutting ferrule A9 profile at ceramic ring B8.Wire connecting screw rod B5 runs through ceramic ring A7, cutting ferrule B10 and ceramic ring B8 successively, and the installation form of cutting ferrule B10 is identical with the installation form of cutting ferrule A9.Between ceramic ring A7 and housing 2 inner surfaces, sealing ring 6 is installed, sealing ring 6 is taper, and the taper of sealing ring 6 is consistent with the taper of housing 2 endoporus.On the excircle of housing 2 openends, be processed with screw thread, for jacking nut 11 is installed.The part that two wire connecting screw rods stretch out ceramic ring B8 is processed with screw thread, for collet threaded is installed.In order to prevent that jacking nut 11 from contacting with clamp nut 12, the position that two wire connecting screw rods are installed on the right side of ceramic ring B8 is processed with projection.Jacking nut 11 pushes ceramic ring B8, cutting ferrule, ceramic ring A7 and sealing ring 6 downwards successively, thereby ensures that the water vapour in external environment can not enter in housing 2.When power supply, power lead is connected on two wire connecting screw rods.
The operation principle of this heating element is: it is power supply that the present embodiment adopts 220V alternating current, after switching on power, and resistance wire 13 fast heatings, thus the surface temperature of helical coil 1 can be reached more than 930 DEG C in 2 minutes.Because the method that adopts resistant to elevated temperatures sealing ring, ceramic ring and cutting ferrule to match at the afterbody of heating element seals, even under high temperature, high humidity and high radiation condition, still can normally start and continuous firing.The features such as the heating element of the present embodiment has high-temp resisting high-humidity resisting, radioresistance, startup is fast, the life-span is long.Be particularly useful for the confined spaces such as npp safety shell.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a resistant to elevated temperatures double-spiral coil type heating element, it is characterized in that, comprise helical coil (1), housing (2), insulating material (3), wire connecting screw rod A (4), wire connecting screw rod B (5), sealing ring (6), ceramic ring A (7), ceramic ring B (8), cutting ferrule A (9), cutting ferrule B (10), jacking nut (11) and clamp nut (12); Wherein cutting ferrule A (9), cutting ferrule B (10) and sealing ring (6) all adopt exotic material to make;
Described helical coil (1) comprises resistance wire (13), insulated tube and metal tube; Resistance wire (13) runs through insulated tube, at the outside of insulated tube suit metal tube; After being set with the metal tube doubling of insulated tube, be processed into helical form, form helical coil (1), helical coil (1) has two parallel outputs; If the two ends of resistance wire (13) are respectively side a and b, the side a and b of resistance wire (13) stretches out respectively two outputs of helical coil (1);
The annexation of heating element entirety is: one end sealing of described housing (2), one end perforate; Housing (2) endoporus is made up of straight hole and bellmouth, and the large end of described bellmouth is positioned at the openend of housing (2); Two outputs of helical coil (1) stretch in housing (2) from the blind end of housing (2), the A end of resistance wire (13) is connected with the wire connecting screw rod A (4) that is positioned at housing (2) by after the insulating material in straight hole (3), the B end of resistance wire (13) is connected with the wire connecting screw rod B (5) that is positioned at housing (2) by after the insulating material in straight hole (3), and the part that guarantee resistance wire (13) stretches out helical coil (1) output is positioned at insulating material (3) completely; Described ceramic ring A (7) and ceramic ring B (8) are taper pylon, the excircle dimension of ceramic ring A (7) is less than the excircle dimension of ceramic ring B (8), ceramic ring A (7) and ceramic ring B (8) are arranged in the bellmouth of housing (2) successively, wherein one end of ceramic ring A (7) contacts with insulating material (3), the other end passes through cutting ferrule A (9) and is connected with ceramic ring B (8), ensures that the taper of ceramic ring A (7) and ceramic ring B (8) is consistent with the taper of housing (2) endoporus; Gapped between the excircle of ceramic ring A (7) and housing (2) inner surface, ceramic ring B (8) contacts with housing (2) inner surface; Described cutting ferrule A (9) is olive shape, and center is porose, for running through wire connecting screw rod A (4); Wire connecting screw rod A (4) runs through ceramic ring A (7), cutting ferrule A (9) and ceramic ring B (8) successively; Be processed with the side that is connected of cutting ferrule A (9) groove matching with cutting ferrule A (9) profile at ceramic ring A (7), be processed with the side that is connected of cutting ferrule A (9) groove matching with cutting ferrule A (9) profile at ceramic ring B (8); Wire connecting screw rod B (5) runs through ceramic ring A (7), cutting ferrule B (10) and ceramic ring B (8) successively, and the installation form of cutting ferrule B (10) is identical with the installation form of cutting ferrule A (9); Between ceramic ring A (7) and housing (2) inner surface, sealing ring (6) is installed, sealing ring (6) is taper, ensures that the taper of sealing ring (6) is consistent with the taper of housing (2) endoporus;
On the excircle of housing (2) openend, be processed with screw thread, for jacking nut (11) is installed; The part that two wire connecting screw rods stretch out ceramic ring B (8) is processed with screw thread, for clamp nut (12) is installed; In order to prevent that jacking nut (11) from contacting with clamp nut (12), the position that two wire connecting screw rods are installed on the right side of ceramic ring B (8) is processed with projection.
2. the resistant to elevated temperatures double-spiral coil type of one as claimed in claim 1 heating element, is characterized in that, the caliber of described metal tube is 1mm-6.5mm.
3. the resistant to elevated temperatures double-spiral coil type of one as claimed in claim 1 heating element, is characterized in that, the length of described helical coil (1) is 10mm-100mm.
4. the resistant to elevated temperatures double-spiral coil type of one as claimed in claim 1 heating element, is characterized in that, the material of described ceramic ring A (7) and ceramic ring B (8) is aluminium oxide, zirconia or silicon nitride.
5. the resistant to elevated temperatures double-spiral coil type of one as claimed in claim 1 heating element, is characterized in that, the material of described cutting ferrule A (9) and cutting ferrule B (10) is polytetrafluoroethylene, rubber or graphite.
6. the resistant to elevated temperatures double-spiral coil type of one as claimed in claim 1 heating element, is characterized in that, the material of described sealing ring (6) is polytetrafluoroethylene, rubber or graphite.
7. the resistant to elevated temperatures double-spiral coil type of one as claimed in claim 1 heating element, is characterized in that, the material of described resistance wire (13) is nickel, tungsten, paper tinsel, Fe-Cr-Al alloy or nichrome.
8. the resistant to elevated temperatures double-spiral coil type of one as claimed in claim 1 heating element, is characterized in that, aluminium oxide or magnesium oxide that described insulating material (3) is powdery.
9. the resistant to elevated temperatures double-spiral coil type of one as claimed in claim 1 heating element, is characterized in that, the thickness of described insulating material (3) is 5mm-50mm.
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| CN201210359028.5A CN102883481B (en) | 2012-09-25 | 2012-09-25 | High-temperature-resistant double-helix coil type heating element |
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| CN201210359028.5A CN102883481B (en) | 2012-09-25 | 2012-09-25 | High-temperature-resistant double-helix coil type heating element |
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| CN102883481B true CN102883481B (en) | 2014-07-30 |
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| DE102013212283A1 (en) * | 2013-06-26 | 2014-12-31 | Robert Bosch Gmbh | Glow tube for a controllable glow plug |
| CN106376113A (en) * | 2016-09-14 | 2017-02-01 | 扬中市华荣电器设备有限公司 | Manufacturing method for sand-blasted fin electric heating pipe assembly |
| CN106335005A (en) * | 2016-09-14 | 2017-01-18 | 扬中市华荣电器设备有限公司 | Manufacturing method of sand blasting fin electric heating pipe assembly |
| CN106376112A (en) * | 2016-09-14 | 2017-02-01 | 扬中市华荣电器设备有限公司 | Manufacturing method for sand-blasted electric heating pipe assembly |
| RU2684907C1 (en) * | 2018-07-06 | 2019-04-16 | Акционерное общество "Ордена Трудового Красного Знамени и ордена труда ЧССР опытное конструкторское бюро "ГИДРОПРЕСС" | Bus arrangement of block tubular electric heaters |
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| JP2000106269A (en) * | 1998-09-29 | 2000-04-11 | Sakaguchi Dennetsu Kk | Heat exchanger for heating reaction gas for semiconductor manufacturing apparatus |
| CN201678765U (en) * | 2010-05-04 | 2010-12-22 | 雅安永旺硅业有限公司 | Combined electrode insulation ring |
| CN202818645U (en) * | 2012-09-25 | 2013-03-20 | 中国船舶重工集团公司第七一八研究所 | High-temperature-resistant spiral coil type heating element |
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Address after: 056027 No. 17, Exhibition Road, Handan, Hebei Patentee after: 718th Research Institute of China Shipbuilding Corp. Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: 056027 No. 17, Exhibition Road, Handan, Hebei Patentee before: Handan Purifying Equipment Research Institute Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE |